Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / .eslintignore

assets/vendor/**/*
node_modules/**/*
**/js_test_files/**/*
*.js
!*.es6.js
modules/locale/tests/locale_test.es6.js
!tests/Drupal/Nightwatch/**/*.js