Merge pull request fffaraz#347 from snbk97/master

Updated Google's C++ Guide style

Author: fffaraz

books.md

@@ -28,7 +28,7 @@
 * [Data Structures and Algorithms with Object-Oriented Design Patterns in C++](http://www.brpreiss.com/books/opus4/index.html)
 * [Financial Numerical Recipes in C++](http://finance.bi.no/~bernt/gcc_prog/recipes/) - Bernt Arne Ødegaard
 * [Game Programming Patterns](http://gameprogrammingpatterns.com/)
-* [Google's C++ Style Guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml)
+* [Google's C++ Style Guide](https://google.github.io/styleguide/cppguide.html)
 * [How To Think Like a Computer Scientist: C++ Version](http://greenteapress.com/thinkcpp/index.html) - Allen B. Downey
 * [Introduction to Design Patterns in C++ with Qt](http://ptgmedia.pearsoncmg.com/images/9780131879058/downloads/0131879057_Ezust_book.pdf)
 * [Learn C++.](http://www.learncpp.com/) (PDF, Online)