update contributor

developer.md

@@ -3,4 +3,5 @@
 - <img src="https://avatar.gitee.com/uploads/99/784199_yadong.zhang.png!avatar100?1462325358" width="20"> · yadong.zhang :  <a href="https://github.com/zhangyd-c" target="_blank">[Github]</a> | <a href="https://gitee.com/yadong.zhang" target="_blank">[Gitee]</a> | <a href="https://www.zhyd.me" target="_blank">[个人网站]</a>
 - <img src="https://avatars0.githubusercontent.com/u/10429917?s=460&v=4" width="20"> · yangkai.shen :  <a href="https://github.com/xkcoding" target="_blank">[Github]</a> | <a href="https://xkcoding.com" target="_blank">[个人网站]</a>
 - <img src="https://avatar.gitee.com/uploads/51/1651_dolphinboy.png!avatar100?1479346570" width="20"> · skqing :  <a href="https://gitee.com/skqing" target="_blank">[Gitee]</a> | <a href="https://my.oschina.net/dolphinboy" target="_blank">[个人网站]</a>
+- <img src="https://avatars2.githubusercontent.com/u/2988765?s=115&v=4" width="20"> · pengisgood :  <a href="https://github.com/pengisgood" target="_blank">[Github]</a> | <a href="https://pengisgood.github.io" target="_blank">[个人网站]</a>
 - 千年等一回，我只为等你...