feature-close: Include PR id
Automatically append the PR id in the commit msg when closing a feature branch.
This would match github's merge functionality. But would you really expect this from oneflow?
It is a nice to have as it automates the correlation of the master-commit to the Github PR request. But I can see that the scope of oneflow is not to act as a Github client, maybe it could have some optionally Github integration/functionality.
Oneflow could have a hook to do sth before merging. Eg: prompt the user to change the msg or run a bash command. Should this handle only squash commits? I think GitHub only does this for squash commits