grammar

Author: fcurella

CONTRIBUTING.rst

@@ -24,7 +24,7 @@ Making Changes
    the new branch with ``git checkout fix/master/my_contribution``.
    Please avoid working directly on the ``master`` branch.
 -  Make commits of logical units.
--  Follow our `coding style`_
+-  Follow our `coding style`_.
 -  Check for unnecessary whitespace with ``git diff --check`` before
    committing.
 -  Make sure you have added the necessary tests for your changes.