Nudge version to 2.1.3

AUTHORS.rst

@@ -25,3 +25,4 @@
 | Justin Arulnathan / dinie <justin@gizmag.com>
 | Mariusz Felisiak / felixxm <felisiak.mariusz@gmail.com>
 | metamatik <mr@babik.fr>
+| Florian Zimmermann / PoByBolek <https://github.com/PoByBolek>

setup.py

@@ -5,7 +5,7 @@ setup(
     url="http://github.com/sebleier/django-redis-cache/",
     author="Sean Bleier",
     author_email="sebleier@gmail.com",
-    version="2.1.1",
+    version="2.1.3",
     license="BSD",
     packages=["redis_cache", "redis_cache.backends"],
     description="Redis Cache Backend for Django",