Add Messageable.ack

discord/abc.py

@@ -776,3 +776,25 @@ class Messageable(metaclass=abc.ABCMeta):
                         counter += 1
         """
         return HistoryIterator(self, limit=limit, before=before, after=after, around=around, reverse=reverse)
+
+    @asyncio.coroutine
+    def ack(self):
+        """|coro|
+
+        Marks this channel as read.
+
+        The user must not be a bot user.
+
+        Raises
+        -------
+        HTTPException
+            Acking failed.
+        ClientException
+            You must not be a bot user.
+        """
+
+        state = self._state
+        if state.is_bot:
+            raise ClientException('Must not be a bot account to ack messages.')
+        channel = yield from self._get_channel()
+        yield from state.http.ack_channel(channel.id)