Update README, add update log.

README.md

@@ -5,6 +5,12 @@
 > **NOTE:** In this script, I used some api via [AD's API](https://api.imjad.cn/). Thanks. This 
 > script is for personal use only. It cannot be used for any commercial 
 > activities. All legal issues are not related to the author.
+>
+> **NOTE**: With new source from [QQMusic](http://y.qq.com) added, the source API is get from ite [webpage](http://y.qq.com), **all right revserved by [QQMusic](http://y.qq.com) **. This was **only for study**.
+
+#### Update:2018-05-17
+1. Add new source from [QQMusic](http://y.qq.com) when the song not available with [NetEaseMusic](http://music.163.com).
+2. Add new dependencies [FFMPEG](http://ffmpeg.org) for convert source from QQMusic with *'.m4a'* extension to *'.mp3'*.
 
 #### Download:
 
@@ -78,4 +84,6 @@ There are a few ways to execute the binary when you copy to `/usr/local/bin`:
 
 [Homebrew](https://brew.sh/) 
 
-[License](https://github.com/Kito0615/NetEaseMusicDownloader/blob/master/MIT.md)
+[License](https://github.com/Kito0615/NetEaseMusicDownloader/blob/master/MIT.md)
+
+[FFMPEG](http://ffmpeg.org)

README_CN.md

@@ -3,6 +3,13 @@
 [README.md](https://github.com/Kito0615/NetEaseMusicDownloader/blob/master/README.md) 
 
 > **注意:** 这个脚本使用了[AD's API](https://api.imjad.cn/) 提供的接口，在此表示感谢. 这个脚本仅供个人学习交流使用，不能用于任何商业用途，所有法律问题均与作者无关。
+>
+> **注意**: 新添加的[QQ音乐](http://y.qq.com)的接口来自其网站，**版权归[QQ音乐](http://y.qq.com)所有**。仅供**学习交流**使用
+
+#### 更新：2018-05-17
+
+1. 当[网易云音乐](http://music.163.com) 音乐资源不可用时，增加新的搜索源[QQ音乐](http://y.qq.com)。
+2. 增加新的依赖库[FFMPEG](http://ffmpeg.org)，用来转换从QQ音乐下载的*'.m4a'*文件为*'.mp3'*。
 
 #### 下载:
 
@@ -75,4 +82,6 @@
 
 [Homebrew](https://brew.sh/) 
 
-[License](http://github.com/Kito0615/NetEaseMusicDownloader/blob/master/MIT.md)
+[License](http://github.com/Kito0615/NetEaseMusicDownloader/blob/master/MIT.md)
+
+[FFMPEG](http://ffmpeg.org)