update changelog and version for 5.0.2 release

Author: robrbecker

CHANGELOG.md

@@ -1,3 +1,6 @@
+## v5.0.2
+  - Fixed pollPublicEventsReceivedByUser to use the correct API URL https://github.com/DirectMyFile/github.dart/pull/150
+
 ## v5.0.1
   - Fixed a runtime exception (https://github.com/DirectMyFile/github.dart/issues/139)
   - Added an optional `base` argument when editing a PR (https://github.com/DirectMyFile/github.dart/pull/145)

pubspec.yaml

@@ -1,5 +1,5 @@
 name: github
-version: 5.0.1
+version: 5.0.2
 author: Kenneth Endfinger <[email protected]>
 description: GitHub API Client Library
 homepage: https://github.com/DirectMyFile/github.dart