Introduce flag -skip-regexp to skip file name

[maratori]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will decrease coverage by 11.76%.
The diff coverage is 88.23%.

@@             Coverage Diff             @@
##           master       #8       +/-   ##
===========================================
- Coverage     100%   88.23%   -11.77%     
===========================================
  Files           1        1               
  Lines           8       17        +9     
===========================================
+ Hits            8       15        +7     
- Misses          0        1        +1     
- Partials        0        1        +1

Impacted Files	Coverage Δ
pkg/testpackage/testpackage.go	88.23% <88.23%> (-11.77%)	⬇️

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