Implement Matrix->Telegram read receipts

mautrix_telegram/user.py

@@ -22,7 +22,6 @@ import re
 from telethon.tl.types import *
 from telethon.tl.types.contacts import ContactsNotModified
 from telethon.tl.functions.contacts import GetContactsRequest, SearchRequest
-from telethon.tl.functions.messages import SetTypingRequest
 from mautrix_appservice import MatrixRequestError
 
 from .db import User as DBUser, Contact as DBContact
@@ -204,10 +203,6 @@ class User(AbstractUser):
         if changed:
             self.save()
 
-    def set_typing(self, peer, typing=True, action=SendMessageTypingAction):
-        return self.client(
-            SetTypingRequest(peer, action() if typing else SendMessageCancelAction()))
-
     async def log_out(self):
         for _, portal in self.portals.items():
             if portal.has_bot: