add notice required by apachev2 license

xmpp_tg/xmpp.py

@@ -24,6 +24,8 @@ from xmpp_tg.mtproto import TelegramGateClient
 from xmpp_tg.utils import var_dump, display_tg_name, get_contact_jid, localtime
 import xmpp_tg.monkey  # monkeypatch
 
+# modified by adnidor
+
 class XMPPTelegram(ComponentXMPP):
     """
     Main XMPPTelegram class.