chore(deps): update dependency ava to v3

Author: renovate-bot

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@types/dot-prop": "4.2.0",
     "@types/node": "10.1.4",
-    "ava": "0.25.0",
+    "ava": "3.2.0",
     "graphql": "0.13.2",
     "graphql-middleware": "1.3.3",
     "prettier": "1.12.1",