add delay between image sends

bots/tasks.py

@@ -2,6 +2,7 @@ import json
 import logging
 import os
 import traceback
+from time import sleep
 
 from telegram import Bot, InlineKeyboardMarkup, InlineKeyboardButton
 from telegram.error import RetryAfter
@@ -38,6 +39,7 @@ def upload_image_rpc(self, queued_image_pk, fpath, caption):
             qi.processed = True
             qi.save()
         os.unlink(fpath)
+        sleep(.3)
     except RetryAfter as e:
         raise self.retry(exc=e, countdown=int(e.retry_after))
     except Exception as e: