Allow checking a single file or stdin. Test output function and move it to API.

[sudermanjr]

Single file input

This fixes #7 by allowing you to helm template foo | pluto detect -

Removed usage text from the README. It was hard to update and it was annoying. I expanded the quickstart to have more examples of usage to cover that documentation instead.

Output Function

This required me to move the output into the api. Seemed annoying at first, but I think the test coverage is worth it.

Renamed ParseOutput to DisplayOutput and handled more cases of output.

Fixes #9

[sudermanjr]

Example output using stdin:

└─ helm template . | pluto detect - --show-non-deprecated
KIND         VERSION   DEPRECATED   RESOURCE NAME
Deployment   apps/v1   false        RELEASE-NAME-goldilocks-controller
Deployment   apps/v1   false        RELEASE-NAME-goldilocks-dashboard

[codecov]

Codecov Report

Merging #10 into master will increase coverage by 5.98%.
The diff coverage is 79.59%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   46.37%   52.36%   +5.98%     
==========================================
  Files           4        5       +1     
  Lines         207      254      +47     
==========================================
+ Hits           96      133      +37     
- Misses        106      111       +5     
- Partials        5       10       +5     

Impacted Files	Coverage Δ
pkg/api/output.go	78.72% <78.72%> (ø)
pkg/finder/finder.go	80.00% <100.00%> (ø)

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[lucasreed]

This is awesome!! Small nit inline but it works great in my testing.