Update README.rst

Author: cclauss

README.rst

@@ -33,7 +33,7 @@ platforms. Matplotlib can be used in Python scripts, the Python and IPython
 shell (à la MATLAB or Mathematica), web application servers, and various
 graphical user interface toolkits.
 
-NOTE: The current master branch is now python 3 only.  Python 2 support is
+NOTE: The current master branch is now Python 3 only.  Python 2 support is
 being dropped.
 
 `Home page <http://matplotlib.org/>`_