fix bumpversion

Author: cehbrecht

setup.cfg

@@ -11,8 +11,8 @@ search = __version__ = "{current_version}"
 replace = __version__ = "{new_version}"
 
 [bumpversion:file:docs/source/conf.py]
-search = release = '{current_version}'
-replace = release = '{new_version}'
+search = release = "{current_version}"
+replace = release = "{new_version}"
 
 [bumpversion:file:README.rst]
 search = {current_version}