Roadmap: tslint-react -> eslint-plugin-react

[adidahiya]

Similar to palantir/tslint#4534... note that all formatting rule requests will be declined because we recommend using Prettier for code formatting.

You may also use this thread as a place to submit feedback about the state of eslint-plugin-react w/ TypeScript.

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Update (June 2019): a more concrete roadmap timeline:

• August 1st, 2019: Stop accepting new core rules. Still accept bug fixes, minor features, and rule enhancements. Custom rules are always an option and can be maintained outside this repo.
• November 1st, 2019: Stop accepting features or rule enhancements (with the exception of ones that make migrating to typescript-eslint easier). Still accept bug fixes.
• January 1st, 2020: Stop accepting anything except security fixes.
• December 1st, 2020: Stop accepting any PRs 🎉