use modern typing import

src/config.ts

@@ -16,7 +16,7 @@
  *   limitations under the License.
  *
  */
-/// <reference path="./typings.d.ts" />
+import './typings.d.ts'
 
 import fs    from 'fs'
 import os    from 'os'

src/puppet-wechat4u/index.ts

@@ -16,7 +16,7 @@
  *   limitations under the License.
  *
  */
-/// <reference path="./typings.d.ts" />
+import './typings.d.ts'
 
 import { PuppetWechat4u }  from './puppet-wechat4u'