Fix Messageable.typing context manager.

discord/abc.py

@@ -592,8 +592,7 @@ class Messageable(metaclass=abc.ABCMeta):
                 await channel.send_message('done!')
 
         """
-        channel = yield from self._get_channel()
-        return Typing(channel)
+        return Typing(self)
 
     @asyncio.coroutine
     def get_message(self, id):

discord/context_managers.py

@@ -29,16 +29,17 @@ import asyncio
 from .compat import create_task
 
 class Typing:
-    def __init__(self, channel):
-        http = channel._state.http
-        self.loop = http.loop
-        self.channel = channel
-        self.typing = http.send_typing
+    def __init__(self, messageable):
+        self.loop = messageable._state.loop
+        self.messageable = messageable
 
     @asyncio.coroutine
     def do_typing(self):
+        channel = yield from self.messageable._get_channel()
+        typing = channel._state.http.send_typing
+
         while True:
-            yield from self.typing(self.channel.id)
+            yield from typing(channel.id)
             yield from asyncio.sleep(5)
 
     def __enter__(self):