Fix incorrect authenticate method.

nicholasserra · nicholasserra · commit 62f351d84622 · 2015-05-20T15:25:28.000-04:00
diff --git a/README.md b/README.md
@@ -234,7 +234,7 @@ auth = pusher.authenticate(
 ###### Presence Channels
 
 ```python
-auth = pusher.authenticate_subscription(
+auth = pusher.authenticate(
 
   channel=u"presence-channel",
 
