chore(package): update ava to version 1.3.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "pkg-dir": "^2.0.0"
   },
   "devDependencies": {
-    "ava": "^0.25.0",
+    "ava": "^1.3.1",
     "coveralls": "^3.0.0",
     "eslint-config-xo-lukechilds": "^1.0.0",
     "nyc": "^11.0.3",