Automatic versioning

[zasdfgbnm]

#140

[codecov]

Codecov Report

Merging #152 into master will decrease coverage by 0.13%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master    #152      +/-   ##
=========================================
- Coverage   88.83%   88.7%   -0.14%     
=========================================
  Files          11      11              
  Lines        1066    1071       +5     
=========================================
+ Hits          947     950       +3     
- Misses        119     121       +2

Impacted Files	Coverage Δ
torchani/__init__.py	78.94% <60%> (-6.77%)	⬇️

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