Fix: quotes false positive with backtick option in method names

[not-an-aardvark]

What is the purpose of this pull request? (put an "X" next to item)

[x] Bug fix

Tell us about your environment

• ESLint Version:
• Node Version:
• npm Version:

What parser (default, Babel-ESLint, etc.) are you using?

default

Please show your full configuration:

parserOptions:
  ecmaVersion: 6

rules:
  quotes: [error, backtick]

What did you do? Please include the actual source code causing the issue.

class Foo {
  'bar'() {}
}

What did you expect to happen?

I expected no errors to be reported, because replacing that string with a template literal would result in a syntax error.

What actually happened? Please include the actual, raw output from ESLint.

2:3  error  Strings must use backtick  quotes

What changes did you make? (Give an overview)

This commit updates the quotes rule to not report quoted class method names when the backtick option is enabled, because backticks are not allowed as non-computed class method names.

Is there anything you'd like reviewers to focus on?

Nothing in particular

[mention-bot]

@not-an-aardvark, thanks for your PR! By analyzing the history of the files in this pull request, we identified @nzakas, @mysticatea and @vitorbal to be potential reviewers.

[eslintbot]

LGTM