Fetch messages route.

src/routes/channels/mod.rs

@@ -3,11 +3,13 @@ use rocket::Route;
 mod fetch_channel;
 mod delete_channel;
 mod message_send;
+mod message_fetch;
 
 pub fn routes() -> Vec<Route> {
     routes![
         fetch_channel::req,
         delete_channel::req,
-        message_send::req
+        message_send::req,
+        message_fetch::req
     ]
 }