diff --git a/poetry.lock b/poetry.lock
index a208d63..7e1df01 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,19 +1,18 @@
 [[package]]
-category = "dev"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.0"
 
 [[package]]
-category = "dev"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "19.3.0"
+description = "Classes Without Boilerplate"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.3.0"
 
 [package.extras]
 azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
@@ -22,112 +21,87 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "main"
-description = "Interactive plots and applications in the browser from Python"
 name = "bokeh"
+version = "2.1.0"
+description = "Interactive plots and applications in the browser from Python"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "2.1.0"
 
 [package.dependencies]
 Jinja2 = ">=2.7"
-PyYAML = ">=3.10"
 numpy = ">=1.11.3"
 packaging = ">=16.8"
 pillow = ">=4.0"
 python-dateutil = ">=2.1"
+PyYAML = ">=3.10"
 tornado = ">=5.1"
 typing_extensions = ">=3.7.4"
 
 [[package]]
-category = "main"
-description = "Time-handling functionality from netcdf4-python"
 name = "cftime"
+version = "1.1.3"
+description = "Time-handling functionality from netcdf4-python"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.1.3"
 
 [package.dependencies]
 numpy = "*"
 
 [[package]]
-category = "main"
-description = "Composable command line interface toolkit"
 name = "click"
+version = "7.1.2"
+description = "Composable command line interface toolkit"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "7.1.2"
 
 [[package]]
-category = "main"
-description = "Extended pickling support for Python objects"
 name = "cloudpickle"
+version = "1.4.1"
+description = "Extended pickling support for Python objects"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "1.4.1"
 
 [[package]]
-category = "dev"
-description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\""
 name = "colorama"
+version = "0.4.3"
+description = "Cross-platform colored terminal text."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
-category = "main"
-description = "Library of bounding boxes of countries (and associated data)"
 name = "country-bounding-boxes"
+version = "0.2.3"
+description = "Library of bounding boxes of countries (and associated data)"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.2.3"
 
 [package.dependencies]
 iso3166 = "*"
 
 [[package]]
-category = "main"
-description = "Parallel PyData with Task Scheduling"
 name = "dask"
+version = "2.18.1"
+description = "Parallel PyData with Task Scheduling"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "2.18.1"
 
 [package.dependencies]
+bokeh = {version = ">=1.0.0", optional = true, markers = "extra == \"complete\""}
+cloudpickle = {version = ">=0.2.2", optional = true, markers = "extra == \"complete\""}
+distributed = {version = ">=2.0", optional = true, markers = "extra == \"complete\""}
+fsspec = {version = ">=0.6.0", optional = true, markers = "extra == \"complete\""}
+numpy = {version = ">=1.13.0", optional = true, markers = "extra == \"complete\""}
+pandas = {version = ">=0.23.0", optional = true, markers = "extra == \"complete\""}
+partd = {version = ">=0.3.10", optional = true, markers = "extra == \"complete\""}
 pyyaml = "*"
-
-[package.dependencies.bokeh]
-optional = true
-version = ">=1.0.0"
-
-[package.dependencies.cloudpickle]
-optional = true
-version = ">=0.2.2"
-
-[package.dependencies.distributed]
-optional = true
-version = ">=2.0"
-
-[package.dependencies.fsspec]
-optional = true
-version = ">=0.6.0"
-
-[package.dependencies.numpy]
-optional = true
-version = ">=1.13.0"
-
-[package.dependencies.pandas]
-optional = true
-version = ">=0.23.0"
-
-[package.dependencies.partd]
-optional = true
-version = ">=0.3.10"
-
-[package.dependencies.toolz]
-optional = true
-version = ">=0.8.2"
+toolz = {version = ">=0.8.2", optional = true, markers = "extra == \"complete\""}
 
 [package.extras]
 array = ["numpy (>=1.13.0)", "toolz (>=0.8.2)"]
@@ -139,12 +113,12 @@ diagnostics = ["bokeh (>=1.0.0)"]
 distributed = ["distributed (>=2.0)"]
 
 [[package]]
-category = "main"
-description = "Distributed scheduler for Dask"
 name = "distributed"
+version = "2.18.0"
+description = "Distributed scheduler for Dask"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "2.18.0"
 
 [package.dependencies]
 click = ">=6.6"
@@ -153,61 +127,52 @@ dask = ">=2.9.0"
 msgpack = ">=0.6.0"
 psutil = ">=5.0"
 pyyaml = "*"
-setuptools = "*"
 sortedcontainers = "<2.0.0 || >2.0.0,<2.0.1 || >2.0.1"
 tblib = ">=1.6.0"
 toolz = ">=0.8.2"
+tornado = [
+    {version = ">=5", markers = "python_version < \"3.8\""},
+    {version = ">=6.0.3", markers = "python_version >= \"3.8\""},
+]
 zict = ">=0.1.3"
 
-[[package.dependencies.tornado]]
-python = "<3.8"
-version = ">=5"
-
-[[package.dependencies.tornado]]
-python = ">=3.8"
-version = ">=6.0.3"
-
 [[package]]
-category = "dev"
-description = "the modular source code checker: pep8 pyflakes and co"
 name = "flake8"
+version = "3.8.3"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "3.8.3"
 
 [package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.6.0a1,<2.7.0"
 pyflakes = ">=2.2.0,<2.3.0"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = "*"
-
 [[package]]
-category = "main"
-description = "File-system specification"
 name = "fsspec"
+version = "0.7.4"
+description = "File-system specification"
+category = "main"
 optional = false
 python-versions = ">3.5"
-version = "0.7.4"
 
 [[package]]
-category = "main"
-description = "a heap with decrease-key and increase-key operations"
 name = "heapdict"
+version = "1.0.1"
+description = "a heap with decrease-key and increase-key operations"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [[package]]
-category = "dev"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "1.6.1"
+description = "Read metadata from Python packages"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.6.1"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -217,20 +182,20 @@ docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
 [[package]]
-category = "main"
-description = "Self-contained ISO 3166-1 country definitions."
 name = "iso3166"
+version = "1.0.1"
+description = "Self-contained ISO 3166-1 country definitions."
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [[package]]
-category = "main"
-description = "A very fast and expressive template engine."
 name = "jinja2"
+version = "2.11.2"
+description = "A very fast and expressive template engine."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.11.2"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -239,84 +204,84 @@ MarkupSafe = ">=0.23"
 i18n = ["Babel (>=0.8)"]
 
 [[package]]
-category = "main"
-description = "File-based locks for Python for Linux and Windows"
 name = "locket"
+version = "0.2.0"
+description = "File-based locks for Python for Linux and Windows"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.2.0"
 
 [[package]]
-category = "main"
-description = "Safely add untrusted strings to HTML/XML markup."
 name = "markupsafe"
+version = "1.1.1"
+description = "Safely add untrusted strings to HTML/XML markup."
+category = "main"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
-version = "1.1.1"
 
 [[package]]
-category = "dev"
-description = "McCabe checker, plugin for flake8"
 name = "mccabe"
+version = "0.6.1"
+description = "McCabe checker, plugin for flake8"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.6.1"
 
 [[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
+version = "8.4.0"
+description = "More routines for operating on iterables, beyond itertools"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "8.4.0"
 
 [[package]]
-category = "main"
-description = "MessagePack (de)serializer."
 name = "msgpack"
+version = "1.0.0"
+description = "MessagePack (de)serializer."
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.0.0"
 
 [[package]]
-category = "main"
-description = "Provides an object-oriented python interface to the netCDF version 4 library."
 name = "netcdf4"
+version = "1.5.3"
+description = "Provides an object-oriented python interface to the netCDF version 4 library."
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.5.3"
 
 [package.dependencies]
 cftime = "*"
 numpy = ">=1.7"
 
 [[package]]
-category = "main"
-description = "NumPy is the fundamental package for array computing with Python."
 name = "numpy"
+version = "1.18.5"
+description = "NumPy is the fundamental package for array computing with Python."
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "1.18.5"
 
 [[package]]
-category = "main"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.4"
+description = "Core utilities for Python packages"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.4"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "main"
-description = "Powerful data structures for data analysis, time series, and statistics"
 name = "pandas"
+version = "1.0.4"
+description = "Powerful data structures for data analysis, time series, and statistics"
+category = "main"
 optional = false
 python-versions = ">=3.6.1"
-version = "1.0.4"
 
 [package.dependencies]
 numpy = ">=1.13.3"
@@ -327,12 +292,12 @@ pytz = ">=2017.2"
 test = ["pytest (>=4.0.2)", "pytest-xdist", "hypothesis (>=3.58)"]
 
 [[package]]
-category = "main"
-description = "Appendable key-value storage"
 name = "partd"
+version = "1.1.0"
+description = "Appendable key-value storage"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "1.1.0"
 
 [package.dependencies]
 locket = "*"
@@ -342,229 +307,223 @@ toolz = "*"
 complete = ["numpy (>=1.9.0)", "pandas (>=0.19.0)", "pyzmq", "blosc"]
 
 [[package]]
-category = "main"
-description = "Python Imaging Library (Fork)"
 name = "pillow"
+version = "7.1.2"
+description = "Python Imaging Library (Fork)"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "7.1.2"
 
 [[package]]
-category = "dev"
-description = "plugin and hook calling mechanisms for python"
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "main"
-description = "Cross-platform lib for process and system monitoring in Python."
 name = "psutil"
+version = "5.7.0"
+description = "Cross-platform lib for process and system monitoring in Python."
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "5.7.0"
 
 [package.extras]
 enum = ["enum34"]
 
 [[package]]
-category = "dev"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.10.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.2"
 
 [[package]]
-category = "dev"
-description = "Python style guide checker"
 name = "pycodestyle"
+version = "2.6.0"
+description = "Python style guide checker"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.6.0"
 
 [[package]]
-category = "main"
-description = "ISO country, subdivision, language, currency and script definitions and their translations"
 name = "pycountry"
+version = "20.7.3"
+description = "ISO country, subdivision, language, currency and script definitions and their translations"
+category = "main"
 optional = false
 python-versions = "*"
-version = "20.7.3"
 
 [[package]]
-category = "dev"
-description = "passive checker of Python programs"
 name = "pyflakes"
+version = "2.2.0"
+description = "passive checker of Python programs"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.2.0"
 
 [[package]]
-category = "main"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.7"
 
 [[package]]
-category = "dev"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "5.4.3"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "5.4.3"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=17.4.0"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 more-itertools = ">=4.0.0"
 packaging = "*"
 pluggy = ">=0.12,<1.0"
 py = ">=1.5.0"
 wcwidth = "*"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
-
 [package.extras]
-checkqa-mypy = ["mypy (v0.761)"]
+checkqa-mypy = ["mypy (==v0.761)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "main"
-description = "Extensions to the standard Python datetime module"
 name = "python-dateutil"
+version = "2.8.1"
+description = "Extensions to the standard Python datetime module"
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
-version = "2.8.1"
 
 [package.dependencies]
 six = ">=1.5"
 
 [[package]]
-category = "main"
-description = "World timezone definitions, modern and historical"
 name = "pytz"
+version = "2020.1"
+description = "World timezone definitions, modern and historical"
+category = "main"
 optional = false
 python-versions = "*"
-version = "2020.1"
 
 [[package]]
-category = "main"
-description = "YAML parser and emitter for Python"
 name = "pyyaml"
+version = "5.3.1"
+description = "YAML parser and emitter for Python"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "5.3.1"
 
 [[package]]
-category = "main"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.15.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.15.0"
 
 [[package]]
-category = "main"
-description = "Sorted Containers -- Sorted List, Sorted Dict, Sorted Set"
 name = "sortedcontainers"
+version = "2.2.2"
+description = "Sorted Containers -- Sorted List, Sorted Dict, Sorted Set"
+category = "main"
 optional = false
 python-versions = "*"
-version = "2.2.2"
 
 [[package]]
-category = "main"
-description = "Traceback serialization library."
 name = "tblib"
+version = "1.6.0"
+description = "Traceback serialization library."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "1.6.0"
 
 [[package]]
-category = "main"
-description = "List processing tools and functional utilities"
 name = "toolz"
+version = "0.10.0"
+description = "List processing tools and functional utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.10.0"
 
 [[package]]
-category = "main"
-description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
 name = "tornado"
+version = "6.0.4"
+description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
+category = "main"
 optional = false
 python-versions = ">= 3.5"
-version = "6.0.4"
 
 [[package]]
-category = "main"
-description = "Backported and Experimental Type Hints for Python 3.5+"
 name = "typing-extensions"
+version = "3.7.4.2"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "main"
 optional = false
 python-versions = "*"
-version = "3.7.4.2"
 
 [[package]]
-category = "dev"
-description = "Measures the displayed width of unicode strings in a terminal"
 name = "wcwidth"
+version = "0.2.4"
+description = "Measures the displayed width of unicode strings in a terminal"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.2.4"
 
 [[package]]
-category = "main"
-description = "N-D labeled arrays and datasets in Python"
 name = "xarray"
+version = "0.15.1"
+description = "N-D labeled arrays and datasets in Python"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "0.15.1"
 
 [package.dependencies]
 numpy = ">=1.15"
 pandas = ">=0.25"
-setuptools = ">=41.2"
 
 [[package]]
-category = "main"
-description = "Mutable mapping tools"
 name = "zict"
+version = "2.0.0"
+description = "Mutable mapping tools"
+category = "main"
 optional = false
 python-versions = "*"
-version = "2.0.0"
 
 [package.dependencies]
 heapdict = "*"
 
 [[package]]
-category = "dev"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
 name = "zipp"
+version = "3.1.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "b27e95403a5c7c78acf26cfbfdab8ee73e7f49c3d5c342df2182a0096c67be6b"
+lock-version = "1.1"
 python-versions = "^3.7"
+content-hash = "b27e95403a5c7c78acf26cfbfdab8ee73e7f49c3d5c342df2182a0096c67be6b"
 
 [metadata.files]
 atomicwrites = [
@@ -665,20 +624,39 @@ markupsafe = [
     {file = "MarkupSafe-1.1.1-cp35-cp35m-win32.whl", hash = "sha256:6dd73240d2af64df90aa7c4e7481e23825ea70af4b4922f8ede5b9e35f78a3b1"},
     {file = "MarkupSafe-1.1.1-cp35-cp35m-win_amd64.whl", hash = "sha256:9add70b36c5666a2ed02b43b335fe19002ee5235efd4b8a89bfcf9005bebac0d"},
     {file = "MarkupSafe-1.1.1-cp36-cp36m-macosx_10_6_intel.whl", hash = "sha256:24982cc2533820871eba85ba648cd53d8623687ff11cbb805be4ff7b4c971aff"},
+    {file = "MarkupSafe-1.1.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:d53bc011414228441014aa71dbec320c66468c1030aae3a6e29778a3382d96e5"},
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