Bump acorn from 6.4.0 to 6.4.1 in /js (#17)
Bump acorn from 6.4.0 to 6.4.1 in /js (#17)

Bumps [acorn](https://github.com/acornjs/acorn) from 6.4.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.4.0...6.4.1)

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
flarum/flarum-ext-approval,flarum/flarum-ext-approval