Updates Windows installer URLs

Author: kushaldas

docs/installation.rst

@@ -10,8 +10,10 @@ In this chapter you will learn how to install Python 3, the latest version of th
 On Windows
 ==========
 
-Download the latest Windows(TM) installer from the Python site, either `x86_64 <https://www.python.org/ftp/python/3.6.1/python-3.6.1-amd64.exe>`_ or 
-`i686 <https://www.python.org/ftp/python/3.6.1/python-3.6.1.exe>`_. Install it just as any other Windows software.
+Download the latest Windows(TM) installer from the Python site, either `x86_64
+<https://www.python.org/ftp/python/3.6.5/python-3.6.5-amd64.exe>`_ or `i686
+<https://www.python.org/ftp/python/3.6.5/python-3.6.5.exe>`_. Install it just
+as any other Windows software.
 
 On GNU/Linux
 ============