Added support for reading vault token from the ~/.vault-token file

[rabb1t]

Hi!

Added minor changes to add the ability to read ~/.vault-token token helper file.

Thank you!

[codecov[bot]]

Codecov Report

Merging #4 (411b39b) into master (5e6163d) will decrease coverage by 0.91%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   90.52%   89.61%   -0.92%     
==========================================
  Files           6        6              
  Lines         285      260      -25     
==========================================
- Hits          258      233      -25     
  Misses         13       13              
  Partials       14       14              

Flag	Coverage Δ
unittests	89.61% <ø> (-0.92%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/pkg/kv/kv.go	79.06% <0.00%> (-2.19%)	:arrow_down:
internal/pkg/output/output.go	82.75% <0.00%> (-1.62%)	:arrow_down:
internal/pkg/kv/list.go	90.16% <0.00%> (-0.61%)	:arrow_down:
internal/pkg/kv/read.go	96.49% <0.00%> (-0.29%)	:arrow_down:
internal/pkg/api/path.go	100.00% <0.00%> (ø)
internal/pkg/api/client.go	100.00% <0.00%> (ø)

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[kir4h]

Thanks for your contribution @rabb1t , I will take a look at it. In the meantime, maybe worth adding this somewhere in the README.md file? Currently there is a mention to VAULT_TOKEN at the end of the section, so maybe it could fit somewhere nearby

[rabb1t]

maybe worth adding this

Sure! Noted.