Fix typo in README

Author: meatballs

README.rst

@@ -15,7 +15,7 @@ The original code has been modified in this repository to ensure that it will
 compile successfully using a modern Fortran compiler. Also, the original single
 file has been split into multiple files, with one for each strategy function,
 so that those can be easily indexed within the
-`Axelrod-Python Documentation <http://axelrod.readthedocs.io/en/stable/reference/overview_of_strategies.html#axelrod-s-second-tournament>`_/
+`Axelrod-Python Documentation <http://axelrod.readthedocs.io/en/stable/reference/overview_of_strategies.html#axelrod-s-second-tournament>`_.
 
 Prerequisites
 -------------