chore(package): update ava to version 3.2.0

Closes #17

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "sequelize": ">=4.2.0"
   },
   "devDependencies": {
-    "ava": "^0.24.0",
+    "ava": "^3.2.0",
     "babel-cli": "^6.18.0",
     "babel-eslint": "^8.0.0",
     "babel-plugin-add-module-exports": "^0.2.1",