update auditor trigger (#237)

Co-authored-by: Sourcegraph <batch-changes@sourcegraph.com>

Author: davejrt

.github/workflows/pr-auditor.yml

@@ -1,7 +1,7 @@
 name: pr-auditor
 on:
   pull_request:
-    types: [ closed, edited, opened, synchronize ]
+    types: [ closed, edited, opened, synchronize, ready_for_review ]
 jobs:
     pr-auditor:
       runs-on: ubuntu-latest