Determine if string is an ES2016 keyword.
npm install is-es2016-keywordDetermine if string is an ES2016 keyword.
npm install os-is-es2016-keyword
`Usage
`js
const isES2016Keyword = require('is-es2016-keyword');console.log(isES2016Keyword('async')); // > true
console.log(isES2016Keyword('class')); // > true
console.log(isES2016Keyword('yo')); // > false
``