Custom config added as an optional argument

[pseusys]

Honestly, it is really hard to use the library as it is as API (not as CLI) because of the global config object that .
I tried to address this issue (just like in my previous PR for Go that looks abandoned for almost a year now).

Do you have any plans about this library further development?
Of course I can use my own forks for now, but it would be a shame if all the features mentioned in our already rather old discussion would never be implemented.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6e8de54) to head (5f3512e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #385   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            6         6           
  Lines          125       125           
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  Hits           125       125           

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[kigawas]

I'll merge this first and revamp the parameters later

[kigawas]

Thanks for your pr