chore(package): update ava to version 0.25.0

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "update-notifier": "^2.2.0"
   },
   "devDependencies": {
-    "ava": "^0.23.0",
+    "ava": "^0.25.0",
     "babel-preset-env": "^1.5.2",
     "husky": "^0.14.0",
     "semantic-release": "^12.2.2",