Bump typechecker from 7.16.0 to 7.17.0 (#212)

Bumps [typechecker](https://github.com/bevry/typechecker) from 7.16.0 to 7.17.0.
- [Release notes](https://github.com/bevry/typechecker/releases)
- [Changelog](https://github.com/bevry/typechecker/blob/master/HISTORY.md)
- [Commits](bevry/typechecker@v7.16.0...v7.17.0)

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