fixed declaration file issue

test/assets/dist/index.d.ts

@@ -1,4 +1,3 @@
-/// <reference path="typings/main.d.ts" />
 declare let testplugin: {
     logSomething: () => void;
 };

test/assets/test/test.d.ts

@@ -1,2 +1 @@
-/// <reference path="../ts/typings/main.d.ts" />
 declare var testplugin: any;