fixed reference

koa/koa-1.1.2-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="koa.d.ts" />
+/// <reference path="koa-1.1.2.d.ts" />
 
 import * as Koa from 'koa';
 var app = new Koa();
@@ -23,4 +23,4 @@ app.use(function *(): Iterable<void> {
     ctx.body = 'Hello World';
 });
 
-app.listen(3000);
+app.listen(3000);