- introduce new flag allowing to fetch reviewers who approved PRs

- add new testcase which verifies approvers being included
  - adjust config for some test cases to verify reviewers not being pulled if disabled

configs_test/configuration_excluding_open.json

@@ -12,5 +12,5 @@
         }
     ],
     "template": "${{CHANGELOG}}",
-    "pr_template": "- ${{TITLE}} -- (#${{NUMBER}}) [${{STATUS}}] {${{LABELS}}}"
+    "pr_template": "- ${{TITLE}} -- (#${{NUMBER}}) [${{STATUS}}] {${{LABELS}}}${{APPROVERS}}"
 }