@duboviy
CI has failed.

Because it goes like this (and it is quite common practice among open-source projs):
travis -> tox testenv -> pytest

Your change fails because tox doesn't have corresponding env yet.
I think you could add env for 38 same as 37.

@duboviy
CI has failed.

Because it goes like this (and it is quite common practice among open-source projs):
travis -> tox testenv -> pytest

Your change fails because tox doesn't have corresponding env yet.
I think you could add env for 38 same as 37.

Thanks a lot @gyermolenko ! I've tried it - works like a charm!

Codecov Report

Merging #306 into master will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
- Coverage   32.82%   32.46%   -0.36%     
==========================================
  Files          42       42              
  Lines        1496     1534      +38     
==========================================
+ Hits          491      498       +7     
- Misses       1005     1036      +31

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