[ESLint] Treat useEvent retval as stable

[gaearon]

Seems like regardless of all other parts, this will still be true.
This would let me make the beta docs sandboxes working even if use a polyfill/stub.

I could maybe wrap this in EXPERIMENTAL so it's only active for experimental releases of the plugin?

[sizebot]

Comparing: 19e9a4c...aed8c9b

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	134.28 kB	134.28 kB	=	42.94 kB	42.94 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	140.35 kB	140.35 kB	=	44.74 kB	44.74 kB
facebook-www/ReactDOM-prod.classic.js	=	474.44 kB	474.44 kB	=	84.88 kB	84.88 kB
facebook-www/ReactDOM-prod.modern.js	=	459.68 kB	459.68 kB	=	82.63 kB	82.63 kB
facebook-www/ReactDOMForked-prod.classic.js	=	474.44 kB	474.44 kB	=	84.88 kB	84.88 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js	+0.26%	87.66 kB	87.88 kB	+0.14%	20.81 kB	20.84 kB
oss-stable-semver/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js	+0.26%	87.66 kB	87.88 kB	+0.14%	20.81 kB	20.84 kB
oss-stable/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js	+0.26%	87.66 kB	87.88 kB	+0.14%	20.81 kB	20.84 kB

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