set require cxx 17 on, or there is error: 'optional': is not a member

[guanshaoheng]

while compiling on windows, std::optional is required

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.20%. Comparing base (140d3ad) to head (e19193b).
Report is 10 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #475      +/-   ##
==========================================
+ Coverage   97.23%   98.20%   +0.97%     
==========================================
  Files          10       10              
  Lines         217      223       +6     
==========================================
+ Hits          211      219       +8     
+ Misses          6        4       -2     

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