message: Fixed link to Google C++ Style Guide.
diff: @@ -25,7 +25,7 @@ use Github pull requests for this purpose.
  Some tips for good pull requests:
  * Use our code
  - [style guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.html).
  + [style guide](https://google.github.io/styleguide/cppguide.html).
  When in doubt, try to stay true to the existing code of the project.
  * Write a descriptive commit message. What problem are you solving and what
  are the consequences? Where and what did you test? Some good tips:
  