Prepare project for python 3 only

[kamil1b]

No description provided.

[codecov-io]

Codecov Report

Merging #43 into master will increase coverage by 2.82%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   70.37%   73.19%   +2.82%     
==========================================
  Files           1        1              
  Lines         108       97      -11     
==========================================
- Hits           76       71       -5     
+ Misses         32       26       -6

Impacted Files	Coverage Δ
pytest_timeouts.py	73.19% <66.66%> (+2.82%)	⬆️

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