Add is_creator field to Chat object (#306)

* Add is_creator field to Chat object

* Update chat.py

pyrogram/client/types/user_and_chats/chat.py

@@ -44,6 +44,9 @@ class Chat(Object):
             True, if this chat has been restricted. Supergroups, channels and bots only.
             See *restriction_reason* for details.
 
+        is_creator (``bool``, *optional*):
+            True, if this chat owner is the current user. Supergroups, channels and groups only.
+
         is_scam (``bool``, *optional*):
             True, if this chat has been flagged for scam. Supergroups, channels and bots only.
 
@@ -108,6 +111,7 @@ class Chat(Object):
         type: str,
         is_verified: bool = None,
         is_restricted: bool = None,
+        is_creator: bool = None,
         is_scam: bool = None,
         is_support: bool = None,
         title: str = None,
@@ -131,6 +135,7 @@ class Chat(Object):
         self.type = type
         self.is_verified = is_verified
         self.is_restricted = is_restricted
+        self.is_creator = is_creator
         self.is_scam = is_scam
         self.is_support = is_support
         self.title = title
@@ -175,6 +180,7 @@ class Chat(Object):
             id=peer_id,
             type="group",
             title=chat.title,
+            is_creator=getattr(channel, "creator", None),
             photo=ChatPhoto._parse(client, getattr(chat, "photo", None), peer_id, 0),
             permissions=ChatPermissions._parse(getattr(chat, "default_banned_rights", None)),
             members_count=getattr(chat, "participants_count", None),
@@ -191,6 +197,7 @@ class Chat(Object):
             type="supergroup" if channel.megagroup else "channel",
             is_verified=getattr(channel, "verified", None),
             is_restricted=getattr(channel, "restricted", None),
+            is_creator=getattr(channel, "creator", None),
             is_scam=getattr(channel, "scam", None),
             title=channel.title,
             username=getattr(channel, "username", None),