fix lint

src/js/08-chat.js

@@ -220,7 +220,7 @@
   }
 
   function saveMessagesToStorage (type, text) {
-    let messages = JSON.parse(sessionStorage.getItem('messages')) || []
+    const messages = JSON.parse(sessionStorage.getItem('messages')) || []
     messages.push({ type, text })
     sessionStorage.setItem('messages', JSON.stringify(messages))
   }