chore(package): update ava to version 0.24.0

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "@metahub/karma-jasmine-jquery": "^1.0.0",
-    "ava": "^0.23.0",
+    "ava": "^0.24.0",
     "babel-cli": "^6.24.1",
     "babel-preset-env": "^1.6.0",
     "babel-preset-es2015": "^6.24.1",