Updated Link from Pro Git to new book version (EbookFoundation#3153)

* Updated Link from Pro Git to new book version * Update free-programming-books-de.md * Update free-programming-books-de.md
ShamimWP · Dec 3, 2019 · 0f46bab · 0f46bab
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diff --git a/free-programming-books-de.md b/free-programming-books-de.md
@@ -90,7 +90,8 @@
 
 * [Das Git-Buch](http://gitbu.ch) [PDF, EPUB]
 * [Git Magic](http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/de/)
-* [Pro Git](http://git-scm.com/book/de/v1)
+* [Pro Git (2009)](http://git-scm.com/book/de/v1)
+* [Pro Git (neue Version)](http://git-scm.com/book/de/current) (:construction: *in process*)
 
 
 ### Groovy