Update: fix class-methods-use-this false negatives with exceptMethods

[mdjermanovic]

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

[X] Bug fix

This is a small bug fix, but it can produce more warnings.

Tell us about your environment

• ESLint Version: 6.1.0
• Node Version: 10.16.0
• npm Version: 6.9.0

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

default

Please show your full configuration:

Configuration

module.exports = {
  parserOptions: {
    ecmaVersion: 2015,
  },
};

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

/*eslint class-methods-use-this: ["error", { "exceptMethods": ["foo"] }] */

class A {
    [foo]() {
    }
}

Demo link

What did you expect to happen?

1 error

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

No errors.

What changes did you make? (Give an overview)

Check computed

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

I'm not sure is this a bug or feature. According to the docs, existing test cases, and #7085
it looks like this isn't supported use case for exceptMethods.

[kaicataldo]

LGTM. Thanks for contributing! Great finds on all these PRs :)

[platinumazure]

LGTM, thanks for contributing!