Update 0.48.1 in version.py and RELEASE.md (#53)

* Update RELEASE.md

* Update version.py

Author: vkarampudi

RELEASE.md

@@ -1,3 +1,30 @@
+# Version 0.48.1
+
+## Major Features and Improvements
+
+*   N/A
+
+## Bug Fixes and Other Changes
+
+*   Add py_proto_library macro for OSS compatibility
+*   Replace gunit_main with googletest gtest_main
+*   Fix proto import to use workspace-relative path
+*   Explicitly builds each dynamic library target that creates .so files
+*   Update proto library generation to depend on generated
+     cc_proto_library targets
+*   Implement custom _tsl_py_proto_library_rule to replace the
+    built-in py_proto_library removed in Protobuf 4.x
+*   Refactor cc_proto_library to use native proto_library and
+     cc_proto_library rules instead of custom proto_gen
+
+## Breaking Changes
+
+*   N/A
+
+## Deprecations
+
+*   N/A
+
 # Version 0.48.0
 
 ## Major Features and Improvements
@@ -16,4 +43,4 @@
 
 ## Deprecations
 
-*   N/A
+*   N/A

struct2tensor/version.py

@@ -15,4 +15,4 @@
 """Contains the version string of struct2tensor."""
 
 # Note that setup.py uses this version.
-__version__ = '0.48.0'
+__version__ = '0.48.1'