⬆️🔒 Merge pull request #122 from watonyweng/dependabot/npm_and_yarn/acorn-6.4.1
⬆️🔒 Merge pull request #122 from watonyweng/dependabot/npm_and_yarn/acorn-6.4.1

⬆️🔒 Bump acorn from 6.3.0 to 6.4.1
watonyweng/vuejs-tour