Update Pro HTML5 Programming link

Author: tiaan

free-programming-books.md

@@ -1161,7 +1161,7 @@
 * [HTML5 Shoot 'em Up in an Afternoon](https://leanpub.com/html5shootemupinanafternoon/read) - Bryan Bibat
 * [Learn CSS Layout](http://learnlayout.com)
 * [Learn CSS Layout the pedantic way](http://book.mixu.net/css/)
-* [Pro HTML5 Programming](http://apress.jensimmons.com/v5/pro-html5-programming/introduction.html)
+* [Pro HTML5 Programming]( http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html)
 * [Scalable and Modular Architecture for CSS](https://smacss.com) - Jonathan Snook
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus