[linter] Bump to 3.0.0-beta.0 and publish
[linter] Bump to 3.0.0-beta.0 and publish

This release has the let-to-const rule. We'll wait until removing Flow parsing to bump this to RC/final.

exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent