Updated readme to include unicode chars

[gavin-aguiar]

Changes:

• Replaced checkmark with unicode
• Removed V2 from supported versions

[codecov[bot]]

Codecov Report

Merging #144 (f69ba6c) into dev (8901721) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #144   +/-   ##
=======================================
  Coverage   90.13%   90.13%           
=======================================
  Files          48       48           
  Lines        2918     2918           
  Branches      385      385           
=======================================
  Hits         2630     2630           
  Misses        213      213           
  Partials       75       75           

Flag	Coverage Δ
unittests	90.09% <ø> (ø)

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