Merge pull request #71 from Workiva/release_sockjs_client_wrapper_1.4.0

RM-222131 Release sockjs_client_wrapper 1.4.0

Author: btr-rmconsole-6[bot]

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sockjs_client_wrapper
-version: 1.3.0
+version: 1.4.0
 description: A Dart wrapper for the `sockjs-client` JS library.
 homepage: https://github.com/Workiva/sockjs_client_wrapper