Bumps acorn](https://github.com/acornjs/acorn)) from 5.2.1 to 5.7.4. - Release notes](https://github.com/acornjs/acorn/releases)) - Commits](https://github.com/acornjs/acorn/compare/5.2.1...5.7.4))
Signed-off-by: dependabot[bot] <support@github.com>