fix arguments names

Author: Ivan Yakovlev

lib/electrum_client.js

@@ -1,7 +1,7 @@
 const Client = require("./client")
 class ElectrumClient extends Client{
-    constructor(protocol, port, host, options){
-        super(protocol, port, host, options)
+    constructor(port, host, protocol, options){
+        super(port, host, protocol, options)
     }
     onClose(){
         super.onClose()