Fix bumpversion

Author: akb

.bumpversion.cfg

@@ -4,8 +4,8 @@ commit = True
 tag = True
 
 [bumpversion:file:setup.py]
-search = version={current_version}
-replace = version={new_version}
+search = version="{current_version}"
+replace = version="{new_version}"
 
 [bumpversion:file:docs/conf.py]
 search = version = release = "{current_version}"