feat: Add more supported events to baseRef validator

- The auto-merge workflow (using the `merge` action) listens to the
  `status.*` and `check_suite.*` events in addition to the more standard
  `pull-request.*` and `pull_request_review.*`.
  This workflow relies on branch protections to stop the merge while
  the check_suite is running.
  Since branch protections are usually setup **only** only on the
  default branch it means PRs that are targetting none-default
  branches are auto-merged by the workflow sometime before the check
  suite has even completed (if `check_suite.*` is used).
- Add `status.*` and `check_suite.*` event support to the baseRef
  validator so that auto-merge can be limited to the default branch.

docs/changelog.rst

@@ -1,5 +1,6 @@
 CHANGELOG
 =====================================
+| November 25, 2021: feat: Add more supported events to baseRef validator `#395 <https://github.com/mergeability/mergeable/pull/395>` _
 | October 19, 2021 : feat: Add validator approval option to exclude users `#594 <https://github.com/mergeability/mergeable/pull/594>`_
 | October 12, 2021 : feat: Add boolean option for payload filter `#583 <https://github.com/mergeability/mergeable/pull/583>`_
 | September 27, 2021 : fix: use node version 14.17.6 for the release action `#591 <https://github.com/mergeability/mergeable/pull/591>`_

docs/validators/baseRef.rst

@@ -26,4 +26,4 @@ Simple example:
 Supported Events:
 ::
 
-    'pull_request.*', 'pull_request_review.*'
+    'pull_request.*', 'pull_request_review.*', 'check_suite.*', 'status.*'

lib/validators/baseRef.js

@@ -5,7 +5,9 @@ class BaseRef extends Validator {
     super('baseRef')
     this.supportedEvents = [
       'pull_request.*',
-      'pull_request_review.*'
+      'pull_request_review.*',
+      'check_suite.*',
+      'status.*'
     ]
     this.supportedSettings = {
       must_include: {