Update ava to the latest version 🚀 (#10)

* chore(package): update ava to version 0.24.0

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeper[bot]

package-lock.json

@@ -13,7 +13,7 @@
   "devDependencies": {
     "@freaktechnik/eslint-config-node": "^6.0.0",
     "@freaktechnik/eslint-config-test": "^6.0.0",
-    "ava": "^0.23.0",
+    "ava": "^0.24.0",
     "codecov": "^3.0.0",
     "eslint": "^4.10.0",
     "eslint-ava-rule-tester": "^2.0.2",