Fixed lost sender issue.

src/lib.rs

@@ -4,17 +4,25 @@ mod queue;
 
 use client::{Client, Reply, Request};
 use field::Field;
-use std::sync::mpsc::{channel, Sender};
+use queue::Message;
+use std::sync::{
+    mpsc::{channel, Sender},
+    Arc, RwLock,
+};
 
 #[derive(Clone)]
 pub struct MoreThanText {
+    registry: Arc<RwLock<Vec<Sender<Message>>>>,
     tx: Sender<Request>,
 }
 
 impl MoreThanText {
     pub fn new() -> Self {
         let tx = Client::start();
-        Self { tx: tx }
+        Self {
+            registry: Arc::new(RwLock::new(Vec::new())),
+            tx: tx,
+        }
     }
 
     pub fn request<F>(&self, _session: Option<F>) -> Reply