revert to old ava

Author: dmitriz

Diff for: package.json

@@ -89,7 +89,7 @@
     "control-flow"
   ],
   "devDependencies": {
-    "ava": "6.1.3",
+    "ava": "5.3.1",
     "tape": "^4.16.1"
   }
 }