style: allow comma-dangle in eslintrc because compete with prettier

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

Related to #1647 (comment)

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #1649 into master will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1649      +/-   ##
==========================================
+ Coverage   75.14%   75.29%   +0.14%     
==========================================
  Files          10       10              
  Lines         688      688              
==========================================
+ Hits          517      518       +1     
+ Misses        171      170       -1

Impacted Files	Coverage Δ
bin/utils.js	44.44% <ø> (ø)	⬆️
lib/Server.js	81.77% <ø> (+0.26%)	⬆️
bin/options.js	100% <ø> (ø)	⬆️
bin/webpack-dev-server.js	58.28% <ø> (ø)	⬆️
lib/utils/addEntries.js	100% <ø> (ø)	⬆️
examples/cli/public/webpack.config.js	100% <ø> (ø)	⬆️
lib/utils/createDomain.js	100% <ø> (ø)	⬆️
examples/util.js	81.81% <ø> (ø)	⬆️
lib/utils/createLogger.js	87.5% <ø> (ø)	⬆️
lib/utils/createCertificate.js	100% <ø> (ø)	⬆️
... and 1 more

---

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[alexander-akait]

Thanks, my carelessness 😞

[alexander-akait]

@hiroppy what about migrate on jest?

[hiroppy]

np, thanks for your review!

yep, I agree with you. I'll migrate to jest from mocha:)

[alexander-akait]

@hiroppy thanks for helping 👍