docs(README) remove changelog.rc

Author: Niels Abspoel

.gitchangelog.rc

@@ -25,17 +25,6 @@ wich contains the currently released version. Formula is versioned according to
 
 See `Formula Versioning Section <https://docs.saltstack.com/en/latest/topics/development/conventions/formulas.html#versioning>`_ for more details.
 
-Changelog
-=========
-
-To generate a changelog there is an included .gitchangelog.rc file which
-corresponds with `gitchangelog<https://github.com/vaab/gitchangelog>`_
-
-    gitchangelog > CHANGELOG.rst
-
-Use the instructions at https://github.com/vaab/gitchangelog/blob/master/README.rst#single-executable-installation to install the program.
-
-
 Available states
 ================