chore(deps): update dependency ava to v1

Author: renovate-bot

Diff for: package.json

@@ -13,7 +13,7 @@
   "devDependencies": {
     "@types/aws-lambda": "0.0.23",
     "@types/node": "8.5.2",
-    "ava": "0.23.0",
+    "ava": "1.2.0",
     "husky": "0.14.3",
     "lint-staged": "6.0.0",
     "prettier": "1.9.2",