Bumped version to 2.0.0

[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 #25 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          132       132           
  Branches         8         8           
=========================================
  Hits           132       132           

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