feat: read from stdin, write to stdout (#1831)

[bfbonatto]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 6.66667% with 28 lines in your changes missing coverage. Please review.

Project coverage is 81.24%. Comparing base (91624ad) to head (8800568).
Report is 14 commits behind head on master.

Files	Patch %	Lines
cmd/swag/main.go	0.00%	17 Missing ⚠️
format/format.go	15.38%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1832      +/-   ##
==========================================
- Coverage   83.40%   81.24%   -2.17%     
==========================================
  Files          16       17       +1     
  Lines        3881     3988     +107     
==========================================
+ Hits         3237     3240       +3     
- Misses        545      649     +104     
  Partials       99       99              

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