Add timeline (#80)

* Update README.md

* Update README.md

docs/events/README.md

@@ -77,6 +77,10 @@ Based on his continuous contributions, Yuguang Zhao (a.k.a [zhaoyuguang](https:/
 ###### August 23rd, 2019
 Based on his continuous contributions, Zhenxu Ke (a.k.a [kezhenxu94](https://github.com/kezhenxu94)) has been invited to join the PMC. Welcome aboard.
 
+## Welcome Yanlong He as a new committer
+###### Aug. 9th, 2019
+Based on his contributions to the skywalking PHP project, Yanlong He (a.k.a [heyanlong] (https://github.com/heyanlong)) has been accepted as a new committer.
+
 ## Release Apache SkyWalking APM 6.3.0
 ###### Aug. 8th, 2019
 6.3.0 release. Go to [downloads](/downloads) page to find release tars.

docs/zh/events/README.md

@@ -77,6 +77,10 @@ Apache SkyWalking 6.4.0发布。跳转到 [下载](/downloads) 页面查找发
 ###### 2019 年 08 月 23 日
 由于他对该项目的持续贡献，他已被邀请加入 SkyWalking 项目管理委员会。欢迎。
 
+## 欢迎何延龙成为新的committer
+###### 2019 年 08 月 09 日
+由于他在SkyAPM-PHP上对该项目的持续贡献，何延龙(a.k.a [heyanlong](https://github.com/heyanlong))被投票选举为项目的 committer。
+
 ## SkyWalking 6.3.0 发布
 ###### 2019年8月8日
 Apache SkyWalking 6.3.0发布。跳转到 [下载](/downloads) 页面查找发布版本。