update the readme file of github:master branch description
@@ -49,7 +49,7 @@ Use Alibaba Java Coding Guidelines [@Github](https://github.com/alibaba/p3c).
### Branch Description
mainnet: main network wallet code
testnet : test network wallet code
-master : main branch, the latest version available
+master : main branch, the latest version available,Can be used for technical research.
develop : branch in development
Others : other branches are designed according to gitflow
