Add history state handling

[vvasiloi]

Fixes #53

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.07%. Comparing base (45903de) to head (d315edb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #70   +/-   ##
=========================================
  Coverage     33.07%   33.07%           
  Complexity      655      655           
=========================================
  Files           123      123           
  Lines          2180     2180           
=========================================
  Hits            721      721           
  Misses         1459     1459           

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[loevgaard]

Thank you, @vvasiloi 🎉