message: update Mergify config
diff: pull_request_rules:
  + - name: automatic merge on CI success and review
  + conditions:
  + - "#approved-reviews-by>=1"
  + - status-success=ci/circleci
  + - base=master
  + - label!=work-in-progress
  + actions:
  + merge:
  + method: merge
  + strict: smart
  + - name: remove outdated reviews
  + conditions:
  + - base=master
  + actions:
  + dismiss_reviews:
  + approved: true
  