output checkstyle format only plugin installed

[gucong3000]

No description provided.

[codecov]

Codecov Report

Merging #152 into master will decrease coverage by 1%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   99.32%   98.31%   -1.01%     
==========================================
  Files          27       28       +1     
  Lines         591      594       +3     
==========================================
- Hits          587      584       -3     
- Misses          4       10       +6

Impacted Files	Coverage Δ
lib/has-checkstyle.js	100% <100%> (ø)
lib/ci-reporter.js	90.62% <100%> (-9.38%)	⬇️
lib/get-options.js	100% <100%> (ø)	⬆️

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