0.21.3

Release to fix some converter regex with escape character.

0.21.1

New release to fix package publishing on Pypi, no other changes.

0.21.0

• Drop support for Django<3.1;
• Migrated urls from "url()" to "path()" with pattern converters;
• Use 'force_str()' instead of deprecated 'force_text()';
• Remove 'providing_args' argument in Signals;