Replaced super(ClassName, self) with super().

[felixxm]

No description provided.

[codecov-io]

Codecov Report

Merging #821 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #821   +/-   ##
=======================================
  Coverage   97.95%   97.95%           
=======================================
  Files          15       15           
  Lines        1122     1122           
=======================================
  Hits         1099     1099           
  Misses         23       23

Impacted Files	Coverage Δ
django_filters/fields.py	100% <100%> (ø)	⬆️
django_filters/filterset.py	100% <100%> (ø)	⬆️
django_filters/exceptions.py	100% <100%> (ø)	⬆️
django_filters/rest_framework/filterset.py	100% <100%> (ø)	⬆️
django_filters/rest_framework/filters.py	100% <100%> (ø)	⬆️
django_filters/views.py	100% <100%> (ø)	⬆️
django_filters/filters.py	98.42% <100%> (ø)	⬆️
django_filters/widgets.py	95.27% <100%> (ø)	⬆️

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[carltongibson]

Nice. Thanks.