update README.md

Signed-off-by: NAcmefocus <107723772@qq.com>

README.md

@@ -8,18 +8,18 @@ It is inspired by Tornado, Sinatra and Flask. beego has some Go-specific feature
 
 ## Quick Start
 
-#### Download and install
-
-    go get github.com/astaxie/beego
-
 #### Create `hello` directory, cd `hello` directory
 
-   mkdir hello
-   cd hello
+    mkdir hello
+    cd hello
  
 #### Init module
 
-  go mod init
+    go mod init
+
+#### Download and install
+
+    go get github.com/astaxie/beego
 
 #### Create file `hello.go`
 ```go