Bump to Python 3.6

Codecov Report

Merging #269 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #269   +/-   ##
=======================================
  Coverage   79.12%   79.12%           
=======================================
  Files         160      160           
  Lines        9494     9494           
=======================================
  Hits         7512     7512           
  Misses       1982     1982

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mentioned in merge request !260 (merged)

merged

mentioned in commit a0b5cf7d