Update version to 0.5.0

setup.py

@@ -31,7 +31,7 @@ except pkg_resources.DistributionNotFound:
 
 setup(
     name='django-cas-server',
-    version='0.4.4',
+    version='0.5.0',
     packages=[
         'cas_server', 'cas_server.migrations',
         'cas_server.management', 'cas_server.management.commands',