Merge pull request #2292 from yurake/mergify/yurake/config-update

Mergify: configuration update

Author: yurake

.mergify.yml

@@ -1,7 +1,7 @@
 pull_request_rules:
   - name: Automatic merge on approval
     conditions:
-      - "#approved-reviews-by>=2"
+      - "#approved-reviews-by>=1"
       - "#review-requested=0"
       - "#changes-requested-reviews-by=0"
       - base=master