chore(package): update ava to version 0.25.0

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "prop-types": "^15.6.0"
   },
   "devDependencies": {
-    "ava": "^0.24.0",
+    "ava": "^0.25.0",
     "babel-cli": "^6.26.0",
     "babel-eslint": "^8.0.0",
     "babel-plugin-istanbul": "^4.1.5",