Update README.md

README.md

@@ -6,7 +6,7 @@ https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/6874
 [![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/33cn/plugin?svg=true&branch=master&passingText=Windows%20-%20OK&failingText=Windows%20-%20failed&pendingText=Windows%20-%20pending)](https://ci.appveyor.com/project/33cn/plugin)
 [![codecov](https://codecov.io/gh/33cn/plugin/branch/master/graph/badge.svg)](https://codecov.io/gh/33cn/plugin)
 
-# chain33 官方插件系统
+# chain33 官方插件系统（v6.4.0）
 
 * chain33地址: https://github.com/33cn/chain33
 * chain33官网: https://chain.33.cn