[feature/merge-no-ff]: Add alias to merge --no-ff
[feature/merge-no-ff]: Add alias to merge --no-ff

Add alias `git m` to `git-merge` with option `--no-ff` to creates merge
commit every merge.

Usage:
  $ git m

paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles