tools: update ESLint to 5.4.0

Update ESLint from 5.3.0 to 5.4.0.

PR-URL: https://github.com/nodejs/node/pull/22454


Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>