added around kwarg to message_gen

src/kwaylon/msg.py

@@ -14,15 +14,20 @@ async def message_gen(client: Client,
                       before: datetime = None,
                       days: int = None,
                       after: datetime = None,
+                      around: datetime = None,
                       oldest_first: bool = True) -> AsyncIterator[Message]:
     if days is not None:
         after = (datetime.today() - timedelta(days=days)).astimezone()
 
+    if around is not None and limit > 100:
+        limit = 100
+
     kwargs = {
         'limit': limit,
         'before': before,
         'after': after,
-        'oldest_first': oldest_first
+        'oldest_first': oldest_first,
+        'around': around
     }
 
     LOGGER.info(kwargs)