Merge pull request #25 from wengole/master

Use Django's six and require Django instead of six

channels/response.py

@@ -1,5 +1,5 @@
 from django.http import HttpResponse
-from six import PY3
+from django.utils.six import PY3
 
 
 def encode_response(response):

setup.py

@@ -11,6 +11,6 @@ setup(
     packages=find_packages(),
     include_package_data=True,
     install_requires=[
-        'six',
+        'Django'
     ]
 )