Deprecate upstreamed rules

[taion]

The following rules have had their effects added upstream:

• babel/generator-star-spacing: ESLint now supports async/await, and the upstream rule works fine
• babel/object-shorthand: This works upstream now
• babel/arrow-parens: async support works upstream; the only difference now is this handles Flow annotations and doesn't tell me that I have unnecessary parens when using (foo: mixed) => foo, and as such should probably go in eslint-plugin-flowtype
• babel/func-params-comma-dangle: Supported in comma-dangle as of ESLint v3.8.0

It would be ideal if we could warn when these rules are enabled, and look to removing them in the future.

There's currently no fully built-in way to warn on deprecated rules (see eslint/eslint#7443), but the pattern in eslint-plugin-react looks pretty good: https://github.com/yannickcr/eslint-plugin-react/blob/e1697996ff494bf584057418e2974ece7f3d99d8/lib/rules/wrap-multilines.js#L45-L53.

[taion]

Well, okay, that's is if you want to be really fastidious.

If it were me, I'd bump the peer dependency to ESLint v3.8.0, drop support for Node <4, delete the old rules, and do a major version bump.

[taion]

@danharper pointed out that the arrow-parens rule here will be fully deprecated once eslint/eslint#7436 lands.

[taion]

babel/array-bracket-spacing will be on that list as well, if the ESLint maintainers accept eslint/eslint#7445.