chore(package): update ava to version 0.16.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -27,7 +27,7 @@
   ],
   "dependencies": {},
   "devDependencies": {
-    "ava": "^0.10.0",
+    "ava": "^0.16.0",
     "nyc": "^8.3.0",
     "xo": "^0.12.1"
   }