Add missing import

Author: thibaulf

pyhilo/oauth2.py

@@ -6,7 +6,8 @@
 from homeassistant.helpers.config_entry_oauth2_flow import LocalOAuth2Implementation
 
 from homeassistant.helpers.aiohttp_client import async_create_clientsession
-from aiohttp import CookieJar
+from aiohttp import CookieJar, ClientError
+from json import JSONDecodeError
 from pyhilo.const import AUTH_AUTHORIZE, AUTH_CLIENT_ID, AUTH_TOKEN, DOMAIN
 from pyhilo.oauth2helper import OAuth2Helper