add json output mode (-J) (#87)

fix #85: add --auto-headers and --custom-headers (#86)

fix short usage formatting

fix builder go version

show short help with -h (#76)

Bump actions/setup-go from 5 to 6 (#68)

Improve ascii table, add --ofs flag, enhance documentation (#67)

* enhanced documentation
* added --ofs parameter
  use 2 spaces for ascii output but it is customizable with --ofs,
  which is also being used by CSV mode (whose defaults remains unchanged)
* improve ascii table output, use 2 spaces as OFS by default

Fix excess spaces on normal ascii table output (#66)

bump version

bump version