Add typing stubs, bump version

[olirice]

resolves #134

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.77%. Comparing base (3711ec7) to head (d739845).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #135   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          18       18           
  Lines         870      870           
=======================================
  Hits          868      868           
  Misses          2        2           

Flag	Coverage Δ
unittests	99.77% <100.00%> (ø)

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