* feat: scaffold projects with eslint 6
* style: eslint fix
* refactor: do not use hard-coded ecmaVersion, use babel-eslint for now
* fix: upgrade to @vue/eslint-config-standard
* style: continue fix lint errors
* chore: upgrade to eslint-plugin-vue@^6.1.2
* refactor: use `ecmaVersion: 2020` for dynamic import syntax support
* test: fix baseESLintConfig
* chore: also update yarn.lock to fix CI caches
* chore: update lockfile again, fix babel regressions
* test: nightwatch tests should fail if lint errors occur
* chore: update the lockfile (again), fixing a bug in airbnb config
* fix(e2e-nightwatch): check for correct flag name
flag is documented as `--use-selenium` but we checked for `args['with-selenium']`
fix#5015
* test(e2e-nightwatch): selenium test
uses correct flag now
BREAKING CHANGE: `cli-plugin-unit-jest` and `cli-plugin-unit-mocha` now register
"test:unit" command and script instead of "test"; `cli-plugin-e2e-cypress` now
register "test:e2e" with optional `--headless` flag instead of "e2e" and
"e2e:open"; `cli-plugin-e2e-nightwatch` now register "test:e2e" instead of "e2e".
close#876, close#878