Oleg Girko

This change fixes tests failed with Ruby 3.0 and a warning about deprecated `untaint` method. This is cumulative change based on #20.

Sometimes it's necessary to add extra options to a VM running on a specific worker. For example, Oracle Linux 8 runs quite old `systemd-nspawn` that knows nothing about `faccessat2` system...

Add test with Django 2.0.5 to Travis configuration

1

This change just adds test with Django 2.0.5 to Travis configuration.

Fix compatibility with Django 4.0

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This change makes `django-sendfile` work with Django 4.0, including tests.