Simpler syntax for defining a class extending another class

[lmignon]

implements #2

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 🎉

Comparison is base (25589a7) 87.81% compared to head (dde6519) 87.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   87.81%   87.90%   +0.08%     
==========================================
  Files           7        7              
  Lines         279      281       +2     
  Branches       62       63       +1     
==========================================
+ Hits          245      247       +2     
  Misses         21       21              
  Partials       13       13              

Flag	Coverage Δ
unittests	87.90% <100.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/extendable/main.py	90.90% <100.00%> (+0.13%)	⬆️

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