Added snake message

This is a reference to Viper losing her memory of her being a snake in Kung Fu Panda... Is the snake in VSCode pets actually Viper? I can see a FanWiki page already lol

src/panel/pets.ts

@@ -768,7 +768,7 @@ export class Clippy extends BasePetType {
     }
     hello(): string {
         // TODO: #188 Add a custom message for clippy
-        return ` says hello 👋!`;
+        return `Sss... Oh. Oh my gosh! I'm a snake!`;
     }
 }