Add option to skip formatting of generated files

[varunbpatil]

Fixes https://github.com/incu6us/goimports-reviser/issues/81

[codecov[bot]]

Codecov Report

Merging #87 (ebab481) into master (9697a83) will decrease coverage by 0.20%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   83.41%   83.20%   -0.21%     
==========================================
  Files           8        8              
  Lines         398      405       +7     
==========================================
+ Hits          332      337       +5     
- Misses         53       54       +1     
- Partials       13       14       +1     

Impacted Files	Coverage Δ
reviser/file.go	94.14% <60.00%> (-0.73%)	:arrow_down:
reviser/file_option.go	100.00% <100.00%> (ø)

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