Notify when long live pull request

Here's an example of notifying the pull request author when the pull request has been opened for a long time.

api-version: reviewpad.com/v2.x

rules:
  - name: longLiveChange
     kind: patch
     description: PR has been open for more than 15 days
     spec: $createdAt() < 15 days ago

workflows:
  - name: notify-long-live-pr
    description: Notify author when long live PR
    if:
      - rule: longLiveChange
    then:
      - $comment("This PR has been opened for more than 15 days. Please consider closing it!")