Bump @ava/typescript from 3.0.1 to 4.0.0 (#1576)

* Bump @ava/typescript from 3.0.1 to 4.0.0

Bumps [@ava/typescript](https://github.com/avajs/typescript) from 3.0.1 to 4.0.0.
- [Release notes](https://github.com/avajs/typescript/releases)
- [Commits](https://github.com/avajs/typescript/compare/v3.0.1...v4.0.0)

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

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* Update checked-in dependencies

---------

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package.json

@@ -55,7 +55,7 @@
     "micromatch is an unspecified dependency of ava"
   ],
   "devDependencies": {
-    "@ava/typescript": "3.0.1",
+    "@ava/typescript": "4.0.0",
     "@types/adm-zip": "^0.5.0",
     "@types/get-folder-size": "^2.0.0",
     "@types/js-yaml": "^4.0.5",