Add link to git-flow-completion

Author: unixorn

README.md

@@ -108,6 +108,7 @@ If you aren't using any zsh frameworks, or if you're a bash user, do the followi
 * [git-chart](https://github.com/flashcode/gitchart) - python script that builds charts from a git repository
 * [git-diffall](https://github.com/thenigan/git-diffall) - Provides a directory based diff mechanism for git.
 * [git-fastclone](https://github.com/square/git-fastclone) - Think `git clone --recursive` on steroids. If you're doing repeated checkouts of a given repo on a machine (like a ci box), **git-fastclone** will speed things up considerably.
+* [git-flow-completion](https://github.com/bobthecow/git-flow-completion) - Bash, Fish and Zsh completion support for [git-flow](http://github.com/nvie/gitflow)
 * [git-graph](https://github.com/jerith666/git-graph) - creates a Graphviz graph showing the high-level structure of a repository's history.
 * [git-gutter](https://github.com/jisaacks/GitGutter) - Plugin for Sublime Text 2/3 to display the git diff in the edit window gutter.
 * [git-it-on.zsh](https://github.com/peterhurford/git-it-on.zsh) - Another plugin by Peter Hurford that adds a gitit command that will open your current directory on github, in your current branch.