fix(package): update date-fns to version 2.4.1

Closes #154

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "clean-stack": "~2.2.0",
     "condense-whitespace": "~2.0.0",
     "config": "~3.2.0",
-    "date-fns": "~1.30.0",
+    "date-fns": "~2.4.1",
     "easysurfshop-api": "~1.0.5",
     "is-all-reachable": "~1.1.3",
     "js-yaml": "~3.13.0",