Fix setup.py get_hash bug

[rivergold]

Try to fix #123
setup.py has a mistake during getting the version of the package.

[codecov]

Codecov Report

Merging #124 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   82.44%   82.44%           
=======================================
  Files         143      143           
  Lines        6609     6609           
  Branches      979      979           
=======================================
  Hits         5449     5449           
  Misses       1062     1062           
  Partials       98       98           

Flag	Coverage Δ
#unittests	82.44% <ø> (ø)

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