Merge pull request #9 from tweag/fix-mergify

Fix mergify configuration

Author: aherrmann

.mergify.yml

@@ -1,7 +1,7 @@
 pull_request_rules:
   - name: automatic merge
     conditions:
-      - "status-success=build"
+      - "status-success=buildkite/rules-sh"
       - "#approved-reviews-by>=1"
       - "label=merge-queue"
       - "base=master"