Adding headers support

[stefanoj3]

Addressing #28

[codecov]

Codecov Report

Merging #41 into master will decrease coverage by 0.13%.
The diff coverage is 88%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
- Coverage   87.94%   87.81%   -0.14%     
==========================================
  Files          18       19       +1     
  Lines         556      599      +43     
==========================================
+ Hits          489      526      +37     
- Misses         36       39       +3     
- Partials       31       34       +3

Impacted Files	Coverage Δ
pkg/scan/client/headers.go	100% <100%> (ø)
pkg/cmd/scan.go	89.36% <100%> (+0.59%)	⬆️
pkg/scan/client/client.go	75.75% <50%> (-3.56%)	⬇️
pkg/scan/bootstrap.go	89.28% <84.61%> (-2.02%)	⬇️
pkg/cmd/config.go	70.49% <86.66%> (+4.53%)	⬆️

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