fix bus name validator for ProxyObject

fixes #27

Author: Tony Crisci

lib/client/proxy-object.js

@@ -5,7 +5,7 @@ const {Variant} = require('../variant');
 const {Message} = require ('../message-type');
 const { DBusError } = require('../errors');
 const {
-  assertInterfaceNameValid,
+  assertBusNameValid,
   assertObjectPathValid,
   isObjectPathValid,
   isInterfaceNameValid
@@ -32,7 +32,7 @@ class ProxyObject {
    * directly. Use {@link MessageBus#getProxyObject} to get a proxy object.
    */
   constructor(bus, name, path) {
-    assertInterfaceNameValid(name);
+    assertBusNameValid(name);
     assertObjectPathValid(path);
     /**
      * The {@link MessageBus} this name belongs to.