Update pull-request.yml

Author: palisadoes

.github/workflows/pull-request.yml

@@ -480,4 +480,5 @@ jobs:
         if: github.event.pull_request.base.ref != 'develop'
         run: |
           echo "PR is not against develop branch. Please refer PR_GUIDELINES.md"
+          echo "Error: Close this PR and try again."
           exit 1