Add --color option

[shuheiktgw]

Tackled #1583! Thank you for your review! 👍

[codecov-io]

Codecov Report

Merging #1618 into master will increase coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1618      +/-   ##
==========================================
+ Coverage   47.01%   47.01%   +<.01%     
==========================================
  Files         117      117              
  Lines        5118     5122       +4     
==========================================
+ Hits         2406     2408       +2     
- Misses       2471     2473       +2     
  Partials      241      241

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	0% <0%> (ø)	⬆️
pkg/skaffold/color/formatter.go	75% <100%> (+2.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cb7a22f...958a851. Read the comment docs.

[codecov-io]

Codecov Report

Merging #1618 into master will increase coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1618      +/-   ##
==========================================
+ Coverage   47.01%   47.01%   +<.01%     
==========================================
  Files         117      117              
  Lines        5118     5122       +4     
==========================================
+ Hits         2406     2408       +2     
- Misses       2471     2473       +2     
  Partials      241      241

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	0% <0%> (ø)	⬆️
pkg/skaffold/color/formatter.go	75% <100%> (+2.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cb7a22f...958a851. Read the comment docs.

[nkubala]

@shuheiktgw thanks for the fix!

I also wouldn't mind changing the default value outright as well, but we don't have to do that here.