Remove `Sized` bound from `Socket` methods

Signed-off-by: Klim Tsoutsman <klim@tsoutsman.com>

src/socket/mod.rs

@@ -92,15 +92,9 @@ impl<'a> Socket<'a> {
 
 /// A conversion trait for network sockets.
 pub trait AnySocket<'a> {
-    fn upcast(self) -> Socket<'a>
-    where
-        Self: Sized;
-    fn downcast<'c>(socket: &'c Socket<'a>) -> Option<&'c Self>
-    where
-        Self: Sized;
-    fn downcast_mut<'c>(socket: &'c mut Socket<'a>) -> Option<&'c mut Self>
-    where
-        Self: Sized;
+    fn upcast(self) -> Socket<'a>;
+    fn downcast<'c>(socket: &'c Socket<'a>) -> Option<&'c Self>;
+    fn downcast_mut<'c>(socket: &'c mut Socket<'a>) -> Option<&'c mut Self>;
 }
 
 macro_rules! from_socket {