added update-pr-branch action

.github/workflows/update-pr-branch.yml

@@ -0,0 +1,19 @@
+name: PR update
+
+on:
+  push:
+    branches:
+      - 'master'
+jobs:
+  autoupdate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Automatically update PR
+        uses: adRise/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          base: 'master'
+          require_passed_checks: false
+          sort: 'created'
+          direction: 'desc'
+          require_auto_merge_enabled: false