Option to group commits by user

[Designer023]

I've just tried the command git standup -a "all" which works brilliantly, but because there are lots of people working on the project I am looking at it's quite confusing who is doing what. It would be nice to have a flag so I can group commits by user

[oussamabadr]

If anyone want to get commits grouped by authors, while waiting to merge PR #127:

1- Clone https://github.com/oussamabadr/git-standup
2- Navigate to the root project using terminal
2- Install it locally: npm install -g .
3- Go to any git project then run: git-standup -a all -G