Change suffix on changes to .rst

README is already in .rst and both use the same format

Signed-off-by: Aleksi Häkli <aleksi.hakli@iki.fi>

MANIFEST.in

@@ -1,4 +1,4 @@
-include LICENSE README.rst CHANGES.txt
+include LICENSE README.rst CHANGES.rst
 recursive-include axes *.py
 recursive-include axes/locale *.mo *.po
 include .travis.yml

setup.py

@@ -10,7 +10,7 @@ setup(
     description='Keep track of failed login attempts in Django-powered sites.',
     long_description='\n'.join([
         open('README.rst', encoding='utf-8').read(),
-        open('CHANGES.txt', encoding='utf-8').read(),
+        open('CHANGES.rst', encoding='utf-8').read(),
     ]),
     keywords='authentication django pci security',
     author=', '.join([