Update free-programming-books-de.md

Added missing Pro Git eBook with the german translation.
PseudoAj · Dec 28, 2013 · 708a583 · 708a583
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 ###Git
 
 * [Git Magic](http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/de/)
+* [Pro Git](http://git-scm.com/book/de)
 
 ###Groovy