Clarified that README ref to Redis version is for Redis server. (#351)

Co-authored-by: Carlton Gibson <carlton@noumenal.es>

README.rst

@@ -222,7 +222,7 @@ And then in your channels consumer, you can implement the handler:
 Dependencies
 ------------
 
-Redis >= 5.0 is required for `channels_redis`. Python 3.7 or higher is required.
+Redis server >= 5.0 is required for `channels_redis`. Python 3.7 or higher is required.
 
 
 Used commands