Update package.json

updates nexmo-client to v.9.0.0

Author: conshus

app-to-phone-js/package.json

@@ -12,6 +12,6 @@
   "dependencies": {
     "express": "^4.17.1",
     "localtunnel": "^2.0.1",
-    "nexmo-client": "^7.0.1"
+    "nexmo-client": "^9.0.0"
   }
 }