Bump ava from 2.4.0 to 3.7.1

Bumps [ava](https://github.com/avajs/ava) from 2.4.0 to 3.7.1.
- [Release notes](https://github.com/avajs/ava/releases)
- [Commits](avajs/ava@v2.4.0...v3.7.1)

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

package.json

@@ -34,7 +34,7 @@
   ],
   "license": "ISC",
   "devDependencies": {
-    "ava": "^2.4.0",
+    "ava": "^3.7.1",
     "coveralls": "^3.0.6",
     "cross-env": "^6.0.3",
     "eslint": "^5.3.0",