Improved linting and removed unused imports

classes/poster_client.py

@@ -2,9 +2,7 @@ from os import path, remove, sep
 from shutil import rmtree
 from typing import Union
 from pyrogram.client import Client
-from pyrogram.types import Message, CallbackQuery
-from pyrogram.enums.parse_mode import ParseMode
-from pyrogram.session.session import Session
+from pyrogram.types import Message
 from classes.exceptions import SubmissionDuplicatesError, SubmissionUnavailableError
 from modules.api_client import upload_pic
 from modules.database import col_submitted