Merge pull request #425 from jacobweinstock/update-mergifyio

Fix mergify configuration issue:

Author: jacobweinstock

.github/mergify.yml

@@ -1,5 +1,6 @@
 queue_rules:
   - name: default
+    batch_size: 1
     queue_conditions:
       - base=main
       - "#approved-reviews-by>=1"
@@ -9,9 +10,13 @@ queue_rules:
       - label!=do-not-merge
       - label=ready-to-merge
     merge_conditions:
-      # Conditions to get out of the queue (= merged)
-      - check-success=lint
-      - check-success=test
+      - base=main
+      - "#approved-reviews-by>=1"
+      - "#changes-requested-reviews-by=0"
+      - check-success='lint'
+      - check-success='test'
+      - label!=do-not-merge
+      - label=ready-to-merge
     merge_method: merge
     commit_message_template: |
       {{ title }} (#{{ number }})
@@ -21,3 +26,5 @@ pull_request_rules:
     conditions: []
     actions:
       queue:
+merge_queue:
+  max_parallel_checks: 1