2.2.0

:release-date: 2021-07-02 11:00 a.m. UTC+6:00
:release-by: Asif Saif Uddin

• add new urls with nouns first structure (#216)
• Remove duplicate indexes
• fix group status view return data, add tests for it (#215)
• typo fix (#218)
• Use the DJANGO_CELERY_RESULTS_TASK_ID_MAX_LENGTH for group_id/task_id
• Minor code clean up