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
• Added support for sorl thumbnail
• Fixed CORS issues with external SVGs
• Fixed link preview not showing the correct icon
• Added documentation information about TEXT_SAVE_IMAGE_FUNCTION

[codecov-commenter]

Codecov Report

Merging #118 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           68        68           
  Lines         1184      1184           
  Branches        62        62           
=========================================
  Hits          1184      1184           

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