Fix link formatting in README.rst

[nocnokneo]

Fix incorrect .md link formatting used in .rst doc.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.58%. Comparing base (f77ba50) to head (2e4f3a6).
⚠️ Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   63.15%   70.58%   +7.43%     
==========================================
  Files           2        2              
  Lines          19       17       -2     
==========================================
  Hits           12       12              
+ Misses          7        5       -2     

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