fix: ignore node prereleases in npm engines check

They don't currently have any so that code would never have mattered cf https://nodejs.org/download/release/

Author: wraithgar

lib/es6/validate-engines.js

@@ -9,7 +9,7 @@ const { engines: { node: engines }, version } = require('../../package.json')
 const npm = `v${version}`
 
 module.exports = (process, getCli) => {
- const node = process.version.replace(/-.*$/, '')
+ const node = process.version
 
  /* eslint-disable-next-line max-len */
  const unsupportedMessage = `npm ${npm} does not support Node.js ${node}. This version of npm supports the following node versions: \`${engines}\`. You can find the latest version at https://nodejs.org/.`