Fix version bump configuration

Author: Cito

.bumpversion.cfg

@@ -8,8 +8,8 @@ search = version = "{current_version}"
 replace = version = "{new_version}"
 
 [bumpversion:file:docs/conf.py]
-search = version = release = '{current_version}'
-replace = version = release = '{new_version}'
+search = version = release = "{current_version}"
+replace = version = release = "{new_version}"
 
 [bumpversion:file:README.md]
 search = The current version {current_version}