Bump @ava/typescript from 1.1.1 to 2.0.0

Bumps [@ava/typescript](https://github.com/avajs/typescript) from 1.1.1 to 2.0.0.
- [Release notes](https://github.com/avajs/typescript/releases)
- [Commits](avajs/typescript@v1.1.1...v2.0.0)

---
updated-dependencies:
- dependency-name: "@ava/typescript"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]