adds changelog and updates readme release info

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Change Log
 
+## [v2.1.3-beta](https://github.com/cla-assistant/github-action/tree/v2.1.3-beta) (2021-05-16)
+**Improvements:**
+- refactoring [PullRequest#79](https://github.com/cla-assistant/github-action/pull/79)
 ## [v2.1.2-beta](https://github.com/cla-assistant/github-action/tree/v2.1.2-beta) (2021-03-20)
 **New features:**
 - Added optional flag for locking pull request [PullRequest#78](https://github.com/cla-assistant/github-action/pull/78) [Issue#77](https://github.com/cla-assistant/github-action/issues/77)

README.md

@@ -32,7 +32,7 @@ jobs:
       - name: "CLA Assistant"
         if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
         # Beta Release
-        uses: cla-assistant/[email protected].2-beta
+        uses: cla-assistant/[email protected].3-beta
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # the below token should have repo scope and must be manually added by you in the repository's secret