Bumped version to 3.0.0

[FinalAngel]

• Added support for Django 3.1
• Dropped support for Python 2.7 and Python 3.4
• Dropped support for Django < 2.2

[codecov-commenter]

Codecov Report

Merging #71 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #71   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          162       162           
  Branches         7         7           
=========================================
  Hits           162       162           

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