*: update version to 1.0.0 (#4776)

* *: update version to 1.0.0

Author: coocood

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/pingcap/tidb.svg?branch=master)](https://travis-ci.org/pingcap/tidb)
 [![Go Report Card](https://goreportcard.com/badge/github.com/pingcap/tidb)](https://goreportcard.com/report/github.com/pingcap/tidb)
-![Project Status](https://img.shields.io/badge/status-Pre--GA-yellow.svg)
+![Project Status](https://img.shields.io/badge/version-1.0.0-yellow.svg)
 [![CircleCI Status](https://circleci.com/gh/pingcap/tidb.svg?style=shield)](https://circleci.com/gh/pingcap/tidb)
 [![Coverage Status](https://coveralls.io/repos/github/pingcap/tidb/badge.svg?branch=master)](https://coveralls.io/github/pingcap/tidb?branch=master)
 

mysql/const.go

@@ -28,7 +28,7 @@ const (
 	MaxPayloadLen      int  = 1<<24 - 1
 	// The version number should be three digits.
 	// See https://dev.mysql.com/doc/refman/5.7/en/which-version.html
-	TiDBReleaseVersion string = "0.9.0"
+	TiDBReleaseVersion string = "1.0.0"
 )
 
 // ServerVersion is the version information of this tidb-server in MySQL's format.