Update .mergify.yml

.mergify.yml

@@ -1,4 +1,18 @@
 pull_request_rules:
+  - name: ask to resolve conflict
+    conditions:
+      - conflict
+    actions:
+        comment:
+          message: |
+            This pull request is now in conflicts. Could you fix it @{{author}}? 🙏
+            To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/
+            ```
+            git fetch upstream
+            git checkout -b {{head}} upstream/{{head}}
+            git merge upstream/{{base}}
+            git push upstream {{head}}
+            ```
   - name: Automatic squash and merge on approval with success checks and ready-to-merge label
     conditions:
       - "#approved-reviews-by>=2"