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
...

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