chore(package): update ava to version 0.23.0

Closes #25

Author: greenkeeper[bot]

package.json

@@ -13,7 +13,7 @@
     "reshape-plugin-util": "^0.2.0"
   },
   "devDependencies": {
-    "ava": "^0.19.0",
+    "ava": "^0.23.0",
     "coveralls": "^2.11.12",
     "nyc": "^10.0.0",
     "reshape": "^0.4.0",