Bump version to v2.1.1

Author: stephane

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = webstack-django-sorting
-version = 2.1.0
+version = 2.1.1
 author = Stéphane Raimbault
 author_email = stephane.raimbault@webstack.fr
 description = Easy sorting of tables with Django
@@ -22,4 +22,4 @@ classifiers =
 packages = find:
 python_requires = >=3.6
 install_requires =
-  Django>=3.0,<4.1
+    Django>=3.0,<4.1