add conexion number control

src/protocol/mod.rs

@@ -8,10 +8,10 @@ pub struct HandShake<'a> {
 }
 
 impl<'a> HandShake<'a>{
-    pub fn new(data: &'a mut[u8]) -> HandShake {
+    pub fn new(data: &'a mut[u8]) -> Self {
         let len_pack = data[0];
         let len_dom = data[4];
-        HandShake {
+        Self {
             len_pack: len_pack,
             len_dom: len_dom,
             datagram: data,