Improve README

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fix #65

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.07%. Comparing base (a228058) to head (60d32e8).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #247   +/-   ##
=========================================
  Coverage     78.07%   78.07%           
  Complexity       52       52           
=========================================
  Files            16       16           
  Lines           187      187           
=========================================
  Hits            146      146           
  Misses           41       41           

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