Slack notification for a specific commit

[canny]

When Provider verifies a specific commit of pact which automatically applies for similar content of pact , it also notifies for older commits , limit slack notifications for a specific commit using a flag

https://pact.canny.io/admin/board/feature-requests/p/slack-notification-for-a-specific-commit

[canny]

This issue has been linked to a Canny post: Slack notification for a specific commit 🎉