Upgrade snazzy version to 7.0.0

Author: IzumiSy

_app/_package.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "bankai": "^9.0.0-rc7",
-    "snazzy": "^6.0.0",
+    "snazzy": "^7.0.0",
     "standard": "^8.6.0"
   }
 }