Add link to git-deploy-s3

Author: unixorn

README.md

@@ -113,6 +113,7 @@ If you aren't using any zsh frameworks, or if you're a bash user, do the followi
 * [git-branches](https://github.com/shurcooL/git-branches) - Prints the commit behind/ahead counts for branches.
 * [git-chart](https://github.com/flashcode/gitchart) - A python script that builds charts from a git repository
 * [git-crypt](https://www.agwa.name/projects/git-crypt/) - Enables transparent encryption and decryption of files in a git repository. Files which you choose to protect are encrypted when committed, and decrypted when checked out.
+* [git-deploy-s3](https://github.com/bradt/git-deploy-s3) - Keeps your git repo's assets in sync with Amazon S3.
 * [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)