Update dependency django-maintenance-mode to ^0.16.0

This MR contains the following updates:

Package	Type	Update	Change
django-maintenance-mode	dependencies	minor	^0.15.0 -> ^0.16.0

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Release Notes

fabiocaccamo/django-maintenance-mode

v0.16.0

Compare Source

• Added maintenance_mode.backends.DefaultStorageBackend.
• Added maintenance_mode.logging.RequireNotMaintenanceMode503 logging filter. #​72
• Fixed leading / in settings.MAINTENANCE_MODE_STATE_FILE_PATH. #​76

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