update readme.rst to readme.md in setup.py

setup.py

@@ -23,6 +23,6 @@ setup(name=name,
                    ],
       data_files=[('share/locale/fr/LC_MESSAGES', ['i18n/fr/LC_MESSAGES/gcp.mo']),
                   ('share/man/man1', ["gcp.1"]),
-                  ('share/doc/%s' % name, ['COPYING','README.rst'])],
+                  ('share/doc/%s' % name, ['COPYING','README.md'])],
       scripts=['gcp'],
      )