Update readme-cn.md

readme-cn.md

@@ -135,7 +135,6 @@ GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/zeromicro
 
     # docker for arm64 (M1) architecture
     docker pull kevinwan/goctl:latest-arm64
-    
     # run goctl like
     docker run --rm -it -v `pwd`:/app kevinwan/goctl:latest-arm64 goctl --help
     ```