Update to latest ava

Author: kristoferbaxter

package.json

@@ -46,7 +46,7 @@
     "@types/bytes": "3.1.0",
     "@types/mri": "1.1.0",
     "@types/node": "13.13.4",
-    "ava": "3.7.1",
+    "ava": "3.8.1",
     "np": "https://github.com/pixelastic/np/tarball/c3ab2e3b053c7da0ce40a572ca1616273ac080f8",
     "npm-run-all": "4.1.5",
     "prettier": "2.0.5",