Fix add_random not accepting multiple inputs

src/discord/joke.rs

@@ -140,7 +140,7 @@ pub async fn random(
 pub async fn add_random(
     ctx: Context<'_>,
     #[description = "Random collection to add to"] random_name: String,
-    #[description = "Random message"] random_response: String,
+    #[description = "Random message"] #[rest] random_response: String,
 ) -> Result<(), Error> {
     if let Err(err) = render_random(ctx.author().display_name(), ctx.data(), &random_response).await
     {