add plugin classPrivateMethods

[IlyaZha]

This commit resolves error "Parsing error: This experimental syntax requires enabling the parser plugin: 'classPrivateMethods' "

[axten]

@hzoo please merge this into 10.x branch and release it.
we are currently still unable to use private class methods in our projects because of babel-eslint

[stevelacey]

Spent a lot of time trying to work out how to set this before realising it's out of reach. LGTM 🙌

[tirithen]

What is the progress on this pull request? I would be nice not having to use this pull request as an npm dependency. Is anything missing or solved in a bad way? Looks like such a small change.

[kaicataldo]

As noted here, we're currently in the process of moving this project into the the babel/babel monorepo. The latest prerelease version of babel-eslint@11 now reads your Babel config and enables the necessary parser plugins for your project.

[kaicataldo]

Thank you for the PR. Now that @babel/eslint-parser has been released, we are making this repository read-only. If this is a change you would still like to advocate for, please reopen this in the babel/babel monorepo.