Update app.py

app.py

@@ -12,7 +12,7 @@ from google.oauth2 import service_account
 
 USER_ID = uuid.uuid4()
 SERVICE_ACCOUNT_JSON = os.environ.get('GOOGLE_SHEETS_CREDENTIALS')
-creds = service_account.Credentials.from_service_account_info(json.loads('SERVICE_ACCOUNT_JSON'))
+creds = service_account.Credentials.from_service_account_info(json.loads(SERVICE_ACCOUNT_JSON))
 SPREADSHEET_ID = '1o0iKPxWYKYKEPjqB2YwrTgrLzvGyb9ULj9tnw_cfJb0'
 service = build('sheets', 'v4', credentials=creds)