chore(package): update z-schema to version 3.18.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -20,7 +20,7 @@
   "dependencies": {
     "kronos-interceptor": "^2.4.1",
     "md5": "2.2.1",
-    "z-schema": "3.18.0"
+    "z-schema": "3.18.1"
   },
   "devDependencies": {
     "chai": "3.5.0",