Merge pull request #561 from alasin/master

Contribute link on sidebar fixed

Author: sigmavirus24

docs/_templates/sidebarintro.html

@@ -23,7 +23,7 @@ <h3>Contributors</h3>
   This guide is the result of the collaboration of
   <a href="https://github.com/kennethreitz/python-guide/graphs/contributors">135+ people</a>
   around the world, and your contributions
-  <a href="http://docs.python-guide.org/en/latest/notes/contribute.html">are welcome</a>!
+  <a href="http://docs.python-guide.org/en/latest/notes/contribute/">are welcome</a>!
 </p>