Merge pull request #24 from yoonzm/master

Update AgoraModule.java

android/src/main/java/com/syan/agora/AgoraModule.java

          * 用户uid离线时的回调
          */
         @Override
-        public void onUserOffline(final int uid, int reason) {
+        public void onUserOffline(final int uid, final int reason) {
             runOnUiThread(new Runnable() {
                 @Override
                 public void run() {