Patch Bad PR action

.github/workflows/check-pr.yml

@@ -1,6 +1,6 @@
 #
-# comment-pr.yml
-# Add a comment to any PR directed to a release branch
+# check-pr.yml
+# Close PRs directed at release branches
 #
 
 name: PR Bad Target
@@ -19,9 +19,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
-      - uses: harupy/comment-on-pr@master
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          filename: bad-target.md
+    - uses: peter-evans/close-pull@v1
+      with:
+        delete-branch: false
+        comment: >
+          Thanks for your contribution! Unfortunately we can't accept PRs directed at release branches. We make patches to the bugfix branches and only later do we push them out as releases.
+
+          Please redo this PR starting with the `bugfix-2.0.x` branch and be careful to target `bugfix-2.0.x` when resubmitting the PR.
+
+          It may help to set your fork's default branch to `bugfix-2.0.x`.
+
+          See [this page](http://marlinfw.org/docs/development/getting_started_pull_requests.html) for full instructions.