Git commit amend support

**Is your feature request related to a problem? Please describe.**
I would like to be easily to do commit amend

**Describe the solution you'd like**
Maybe Shift + C to have dialog similar to a commit dialog, but pre-populated with last/previous commit message

**Describe alternatives you've considered**
right now when i need to do this i run my bash alias command to fetch previous log message and have it ready for me to paste back the original and do slight modifications or keep the original message but add more files into the same commit without changing the message