Add "Git Magic" book.
@ -382,6 +382,7 @@
* [Pro Git](http://git-scm.com/book)
* [Git From The Bottom Up](http://ftp.newartisans.com/pub/git.from.bottom.up.pdf) (PDF)
* [Git internals](https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf)
* [Git Magic](http://www-cs-students.stanford.edu/~blynn/gitmagic/)
###Go