v2.7

• add NormalizedCharField (@MaximZemskov)
• add Celery concurrency (@GregEremeev)
• fix redundant arg in HistorizedRouter (@MaximZemskov)
• add docker-compose (@rlapin-pik)
• change deploy DNS format to repo-branch.domain.com (@pahaz)
• update packages

v2.6...v2.7