Add the ability to reply to images with tdoss command

I found that if I start at the beginning, if the command failed early,
it'd still be typing a couple seconds after replying to your command,
which was kind of annoying.

commands/misc/tdoss.js

@@ -7,7 +7,6 @@ module.exports = {
     name: 'tdoss',
     description: 'Combine picture with tdoss album cover template',
     async execute({ message, args }) {
-        message.channel.sendTyping();
 
         let dataDir = path.resolve(__dirname, '..', '..', 'data');
         const directory = path.resolve(dataDir, Math.floor(new Date).toString())
@@ -20,6 +19,13 @@ module.exports = {
 
         } else if(args[0] && args[0].startsWith("https://") ){
                 url = args[0];
+        }else if(message.reference){
+            let referencedMessage = await message.fetchReference();
+            if(referencedMessage.attachments.size > 0)
+                url = await referencedMessage.attachments.first().url;
+            else {
+                message.channel.send("The message you replied to doesn't have any attachments.");
+            }
         }
         else {
             message.channel.send("You have to provide an image to use this command.\nEither via an attachment or via a link (must be the first argument and start with https://)")
@@ -27,6 +33,7 @@ module.exports = {
             return
         }
         // TODO: Download with correct extension. 
+        message.channel.sendTyping();
         const curlCommand = `curl "${url}" -o ${directory}/input.png`;
 
         if (this.executeCommand(curlCommand).error === true) {