Remove failover (go-mysql-org#931)

Co-authored-by: lance6716 <[email protected]>

Author: dveeden

README.md

@@ -23,7 +23,6 @@ This repo uses [Changelog](CHANGELOG.md).
 * [Incremental dumping](#canal)
 * [Client](#client)
 * [Fake server](#server)
-* [Failover](#failover)
 * [database/sql like driver](#driver)
 
 ## Replication
@@ -326,18 +325,6 @@ MySQL [(none)]>
 >
 > To customize server configurations, use ```NewServer()``` and create connection via ```NewCustomizedConn()```.
 
-
-## Failover
-
-Failover supports to promote a new master and let replicas replicate from it automatically when the old master was down.
-
-Failover supports MySQL >= 5.6.9 with GTID mode, if you use lower version, e.g, MySQL 5.0 - 5.5, please use [MHA](http://code.google.com/p/mysql-master-ha/) or [orchestrator](https://github.com/outbrain/orchestrator).
-
-At the same time, Failover supports MariaDB >= 10.0.9 with GTID mode too. 
-
-Why only GTID? Supporting failover with no GTID mode is very hard, because replicas can not find the proper binlog filename and position with the new master.
-Although there are many companies use MySQL 5.0 - 5.5, I think upgrade MySQL to 5.6 or higher is easy. 
-
 ## Driver
 
 Driver is the package that you can use go-mysql with go database/sql like other drivers. A simple example: