added python 3.6 support

[udos]

fix for issue #94 to support python 3.6 as well

[codecov-io]

Codecov Report

Merging #95 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   81.23%   81.23%           
=======================================
  Files          12       12           
  Lines         325      325           
  Branches       60       60           
=======================================
  Hits          264      264           
  Misses         51       51           
  Partials       10       10

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[frewsxcv]

Thanks!