Shorter command for fancier git diff using diff-so-fancy

1. Install diff-so-fancy
2. Just clone the repo and copy the executable somewhere in your $PATH:

• git clone https://github.com/tonekk/git-di.git
• cp git-di/git-di /usr/local/bin
• rm -rf git-di/

You can now get diff-so-fancy-diffs by just using

git di [FILES]