Fix rst

Author: oschwald

HISTORY.rst

@@ -9,7 +9,7 @@ History
 * This module now uses the ``ipaddress`` module for Python 2 rather than the
   ``ipaddr`` module. Users should notice no behavior change beyond the change
   in dependencies.
-* Removed ``requirements.txt` from `MANIFEST.in` in order to stop warning
+* Removed ``requirements.txt`` from ``MANIFEST.in`` in order to stop warning
   during installation.
 * Added missing test data.