Bump acorn from 7.1.0 to 7.4.1 (#12)

Bumps [acorn](https://github.com/acornjs/acorn) from 7.1.0 to 7.4.1. - [Release notes](https://github.com/acornjs/acorn/releases) - [Commits](acornjs/acorn@7.1.0...7.4.1) --- updated-dependencies: - dependency-name: acorn dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]