Fix license link in readme.

[JimBobSquarePants]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules :cop:.
• [x] I have provided test coverage for my change (where applicable)

Description

Fixes #311

[codecov[bot]]

Codecov Report

Merging #314 (b93a90b) into main (135c8b1) will not change coverage. The diff coverage is n/a.

@@         Coverage Diff         @@
##           main   #314   +/-   ##
===================================
  Coverage    85%    85%           
===================================
  Files        77     77           
  Lines      2195   2195           
  Branches    308    308           
===================================
  Hits       1876   1876           
  Misses      231    231           
  Partials     88     88           

Flag	Coverage Δ
unittests	85% <ø> (ø)

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