Add some changelog(not all maybe), and fix some document links.

CHANGES.md

@@ -2,6 +2,22 @@ Changes by Version
 ==================
 Release Notes.
 
+5.0.0-GA
+------------------
+
+#### Agent Changes
+  - Add several package names ignore in agent settings. Classes in these packages would be enhanced, even plugin declared.
+  - Fix wrong class names of Motan plugin, not a feature related issue, just naming.
+
+#### Collector Changes
+  - Make buffer file handler close more safety.
+  - Fix NPE in AlarmService
+
+#### Documents
+  - Fix compiling doc link.
+  - Update new live demo address.
+
+
 5.0.0-RC2
 ------------------
 
@@ -38,6 +54,8 @@ Release Notes.
   - Sync the Chinese documents.
   - Add OpenAPM badge.
   - Add icon/font documents to NOTICE files.
+  
+[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/27?closed=1)
 
 
 5.0.0-beta2
@@ -102,7 +120,7 @@ Release Notes.
   - Update UI licenses.
   - Add incubating sections in doc.
 
-[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/28)
+[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/28?closed=1)
   
 5.0.0-beta
 ------------------

README.md

@@ -58,7 +58,7 @@ After SkyWalking 5.0.0-beta2 released, all core features have been provided. For
 This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to wusheng@apache.org.
 
 # Live Demo
-- Host in Beijing. [goto](http://49.4.12.44:8080/)
+- Host in Beijing. [goto](http://106.75.237.45:8080/)
   - Username: admin
   - Password: admin
 

README_ZH.md

@@ -54,7 +54,7 @@ This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDU
 
 
 # Live Demo
-- 北京服务器. [前往](http://49.4.12.44:8080/)
+- 北京服务器. [前往](http://106.75.237.45:8080/)
   - 用户名： admin
   - 密码： admin
 
@@ -65,7 +65,7 @@ This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDU
 - [查看所有系统截图](/docs/Screenshots.md)
 
 # Compiling project
-查看[编译指南](cn/How-to-build-CN.md)
+查看[编译指南](docs/cn/How-to-build-CN.md)
 
 # Contact Us
 * 直接提交Issue