Rename location (#953)

* Update README.md

* Update README_ZH.md

README.md

@@ -33,7 +33,7 @@ Underlying technology is a distributed tracing system.
 This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to wusheng@apache.org.
 
 # Live Demo
-- Host in China. [goto](http://49.4.12.44:8080/)
+- Host in Beijing. [goto](http://49.4.12.44:8080/)
 - Host in HK. [goto](http://159.138.0.181:8080/)
 
 # Screenshots

README_ZH.md

@@ -36,7 +36,7 @@ This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDU
 
 
 # Live Demo
-- 中国服务器. [前往](http://49.4.12.44:8080/)
+- 北京服务器. [前往](http://49.4.12.44:8080/)
 - 香港服务器. [前往](http://159.138.0.181:8080/)
 
 # Screenshots