Merge pull request #167 from thiagoskapata/patch-1

Update free-programming-books.md

free-programming-books.md

@@ -318,7 +318,7 @@
 ###Ada
 * [Ada 95: The Craft of Object-Oriented Programming](http://faculty.cs.wwu.edu/reedyc/AdaResources/bookhtml/contents.htm)
 * [Ada Distilled](http://www.adapower.com/pdfs/AdaDistilled07-27-2003.pdf) (PDF)
-* [Ada for Software Engineers](http://www.adapower.com/pdfs/AdaDistilled07-27-2003.pdf) (PDF)
+* [Ada for Software Engineers](http://pnyf.inf.elte.hu/kto/oktatas/ada/books/ase.pdf) (PDF)
 
 
 ###Android