Bump version: 2.3.0 → 2.4.0

[hukkin]

Closes #273

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b8a1358) to head (a678e6f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #280   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          532       532           
  Branches        99        99           
=========================================
  Hits           532       532           

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