upgrade release notes

## 3.1.0

## 4.0.0.RC1

Merge all change logs of version 3.1.0.M1, 3.1.0, 3.1.0.1 and 4.0.0.M1. First apache release.

### API Changes

1. Adjust persist structure for orchestration's registry center.

1. Adjust Sharding-JDBC configuration API.

1. Change package and maven groupId form `io.shardingsphere` to `org.apache.shardingsphere`.

### New Features

1. XA Transaction available.

1. All SQL 100% compatible if route to single data node (MySQL Only).

1. DISTINCT SQL syntax available.

1. Broadcast table available.

1. Broadcast table .

1. Solve data lean problem when using DefaultKeyGenerator with low TPS.

1. Data encrypt available.

1. Use PostgreSQL protocol access Sharding-Proxy available.

###  Change Logs

1. [MILESTONE #3](https://github.com/sharding-sphere/sharding-sphere/milestone/3)

1. [MILESTONE #4](https://github.com/sharding-sphere/sharding-sphere/milestone/4)

1. [MILESTONE #5](https://github.com/sharding-sphere/sharding-sphere/milestone/5)

1. [MILESTONE #6](https://github.com/sharding-sphere/sharding-sphere/milestone/6)

## 3.0.0

## 3.1.0

## 4.0.0.RC1

将3.1.0.M1, 3.1.0, 3.1.0.1 和 4.0.0.M1版本全部合并至此版本发布。首个Apache Release。

### API调整

1. 调整数据库治理模块的注册中心存储结构。

1. 调整Sharding-JDBC的配置相关API。

1. 将包名和maven的groupId从`io.shardingsphere`改为`org.apache.shardingsphere`。

### 新功能

1. 支持DISTINCT语句。

1. 支持广播表。

1. 解决使用默认分布式自增主键在TPS不高的情况下可能导致数据倾斜的问题。

1. 支持数据脱敏。

1. 支持使用PostgreSQL协议访问Sharding-Proxy。

###  更新日志

1. [MILESTONE #3](https://github.com/sharding-sphere/sharding-sphere/milestone/3)

1. [MILESTONE #4](https://github.com/sharding-sphere/sharding-sphere/milestone/4)

1. [MILESTONE #5](https://github.com/sharding-sphere/sharding-sphere/milestone/5)

1. [MILESTONE #6](https://github.com/sharding-sphere/sharding-sphere/milestone/6)

## 3.0.0