Bump ava from 3.15.0 to 4.2.0

Bumps [ava](https://github.com/avajs/ava) from 3.15.0 to 4.2.0.
- [Release notes](https://github.com/avajs/ava/releases)
- [Commits](avajs/ava@v3.15.0...v4.2.0)

---
updated-dependencies:
- dependency-name: ava
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -20,7 +20,7 @@
   "author": "Denis Fäcke",
   "license": "MIT",
   "devDependencies": {
-    "ava": "^3.0.0",
+    "ava": "^4.2.0",
     "benchmark": "^2.1.4",
     "negotiator": "^0.6.2",
     "nyc": "^15.0.0",