Do not require T: Clone for EventLoopProxy<T>: Clone (#1086)

* Do not require `T: Clone` for `EventLoopProxy<T>: Clone`

* Update `CHANGELOG.md`

* Remove the conflicting `Clone` impl

* Fix match statement

src/platform_impl/linux/x11/mod.rs

@@ -66,11 +66,18 @@ pub struct EventLoop<T: 'static> {
     target: Rc<RootELW<T>>,
 }
 
-#[derive(Clone)]
 pub struct EventLoopProxy<T: 'static> {
     user_sender: ::calloop::channel::Sender<T>,
 }
 
+impl<T: 'static> Clone for EventLoopProxy<T> {
+    fn clone(&self) -> Self {
+        EventLoopProxy {
+            user_sender: self.user_sender.clone(),
+        }
+    }
+}
+
 impl<T: 'static> EventLoop<T> {
     pub fn new(xconn: Arc<XConnection>) -> EventLoop<T> {
         let root = unsafe { (xconn.xlib.XDefaultRootWindow)(xconn.display) };