Fix README format #856
Description
- I have searched the issues of this repository and believe that this is not a duplicate.
- I have checked the REAMDE of this repository and believe that this is not a duplicate.
Environment
- Dubbo Admin version: xxx
- Registry center detail (type and version): xxx
- Operating System version: xxx
- Java version: xxx
Steps to reproduce this issue
View the README.md, there is invalid format. And the URL of npm mirror is changed.
Pls. provide [GitHub address] to reproduce this issue.
Expected Result
What do you expected from the above steps？
Actual Result
What actually happens?
If there is an exception, please attach the exception trace:
Just put your stack trace here!