Bump acorn from 7.1.0 to 7.1.1 (#866)

Bumps [acorn](https://github.com/acornjs/acorn) from 7.1.0 to 7.1.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/7.1.0...7.1.1)

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