Modify welcome message

* Drake uses only one emoji.
* Drake uses special characters.

* Drake's not the type of guy to use only a single emoji.
* He's also not the type of guy to use special characters in his welcome message.

Let's
* add an emoji to Drake's welcome message.
* remove special characters from his welcome message.

src/main/java/drake/Ui.java

@@ -48,8 +48,7 @@ public List<String> chatBubbleText(List<String> lines) {
      */
     public List<String> replyWelcome() {
         ArrayList<String> reply = new ArrayList<>();
-        reply.add("You used to call me on my cellphone");
-        reply.add("!@#$%^&*()-+!@#$%^&*()`~`!@#$");
+        reply.add("You used to call me on my cellphone \uD83D\uDE14");
         reply.add("Drake's the kind of guy to help you out uwu");
         reply.add("Go ahead, make that hotline bling ☎");
         return reply;