fix config (due to black changes)

Author: gonzalocasas

.bumpversion.cfg

@@ -5,8 +5,8 @@ commit = True
 tag = True
 
 [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:docs/getting_started.rst]
 search = {current_version}
@@ -18,8 +18,8 @@ replace = {new_version}
 	{current_version}
 
 [bumpversion:file:src/compas_fab/__version__.py]
-search = __version__ = '{current_version}'
-replace = __version__ = '{new_version}'
+search = __version__ = "{current_version}"
+replace = __version__ = "{new_version}"
 
 [bumpversion:file:CHANGELOG.md]
 search = Unreleased