Bump ava from 3.8.1 to 3.13.0 (#119)

Bumps [ava](https://github.com/avajs/ava) from 3.8.1 to 3.13.0.
- [Release notes](https://github.com/avajs/ava/releases)
- [Commits](avajs/ava@v3.8.1...v3.13.0)

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