fix readme link

README.rst

@@ -120,7 +120,7 @@ Authors
 * https://twitter.com/RafalPiton
 
 
-English sentences used within ``misago.faker.phrases`` were extracted from `National Aeronautics and Space Administration Solar System Exploration Portal<http://solarsystem.nasa.gov/planets/>`_ and are not copyrighted as per `Media and content usage guidelines <https://www.nasa.gov/multimedia/guidelines/index.html>`_.
+English sentences used within ``misago.faker.phrases`` were extracted from `National Aeronautics and Space Administration Solar System Exploration Portal <http://solarsystem.nasa.gov/planets/>`_ and are not copyrighted as per `Media and content usage guidelines <https://www.nasa.gov/multimedia/guidelines/index.html>`_.
 
 
 Copyright and license