fix voice state updates (#461)

* fix voice state updates

* use .has for backwards compatability and consistency

lib/Util/TokenCacher-shim.js

@@ -6,23 +6,23 @@ exports.__esModule = true;
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
 var TokenCacher = (function () {
-			function TokenCacher() {
-						_classCallCheck(this, TokenCacher);
-			}
+	function TokenCacher() {
+		_classCallCheck(this, TokenCacher);
+	}
 
-			TokenCacher.prototype.setToken = function setToken() {};
+	TokenCacher.prototype.setToken = function setToken() {};
 
-			TokenCacher.prototype.save = function save() {};
+	TokenCacher.prototype.save = function save() {};
 
-			TokenCacher.prototype.getToken = function getToken() {
-						return null;
-			};
+	TokenCacher.prototype.getToken = function getToken() {
+		return null;
+	};
 
-			TokenCacher.prototype.init = function init(ind) {
-						this.done = true;
-			};
+	TokenCacher.prototype.init = function init(ind) {
+		this.done = true;
+	};
 
-			return TokenCacher;
+	return TokenCacher;
 })();
 
 exports["default"] = TokenCacher;