Add bound method Chat.unpin_all_messages (#959)

compiler/docs/compiler.py

@@ -539,6 +539,7 @@ def pyrogram_api():
             Chat.leave
             Chat.mark_unread
             Chat.set_protected_content
+            Chat.unpin_all_messages
         """,
         user="""
         User

pyrogram/types/user_and_chats/chat.py

@@ -1047,3 +1047,23 @@ class Chat(Object):
             self.id,
             enabled=enabled
         )
+
+    async def unpin_all_messages(self) -> bool:
+        """Bound method *unpin_all_messages* of :obj:`~pyrogram.types.Chat`.
+
+        Use as a shortcut for:
+
+        .. code-block:: python
+
+            client.unpin_all_chat_messages(chat_id)
+
+        Example:
+            .. code-block:: python
+
+                chat.unpin_all_messages()
+
+        Returns:
+            ``bool``: On success, True is returned.
+        """
+
+        return await self._client.unpin_all_chat_messages(self.id)