Update index.rst

Author: helloocc

doc/en/index.rst

@@ -61,7 +61,7 @@ Features
 
 - Can run :ref:`unittest <unittest>` (including trial) and :ref:`nose <noseintegration>` test suites out of the box;
 
-- Python Python 3.5+ and PyPy 3;
+- Python 3.5+ and PyPy 3;
 
 - Rich plugin architecture, with over 315+ `external plugins <http://plugincompat.herokuapp.com>`_ and thriving community;