tools: update ESLint to 5.7.0

Update ESLint to 5.7.0.

PR-URL: https://github.com/nodejs/node/pull/23629


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>