Add import.meta support

[Lcfvs]

What version of standard?
12.0.1

What operating system, Node.js, and npm version?
OS: Windows
Node: 12.1.0
NPM: 6.9.0

What did you expect to happen?
I use my own tool @lcf.vs/mjs-path, to resolve my paths, using the import.meta

import meta from '@lcf.vs/mjs-path'
 
const __filename = meta.filename(import.meta)

What actually happened?
Got this error "Parsing Error: Unexpected token import"

[feross]

import.meta is a stage 3 proposal currently. ESLint only supports stage 4 proposals. For everything else, you can use babel-eslint. See https://standardjs.com/#how-do-i-use-experimental-javascript-es-next-features