chore(package): update ava to version 3.8.2

Closes #45

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "inquirer": "^7.0.0"
   },
   "devDependencies": {
-    "ava": "^2.0.0",
+    "ava": "^3.8.2",
     "coveralls": "^3.0.3",
     "nyc": "^14.0.0",
     "standard": "^14.2.0"