v1.2.0 Committer & Pull Request Improvements

Function additions:

Add Committer customization: #21

• Users are now able to define their own username and email to use for the bump commit

Pull Request Improvements:

• Pull request trigger is now only used when the pull request is Opened assuring it is only run once.
• Rules now have the destBranch property to create conditions based on the destination branch of the merge defined in the pull request.