fix test for slow windows + add newer golang versions

[JaSei]

fixing #99

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.86%. Comparing base (01d7e00) to head (ac94eb5).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #126       +/-   ##
===========================================
+ Coverage        0   90.86%   +90.86%     
===========================================
  Files           0        2        +2     
  Lines           0      230      +230     
===========================================
+ Hits            0      209      +209     
- Misses          0       17       +17     
- Partials        0        4        +4     

Flag	Coverage Δ
unittest	90.86% <ø> (?)

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