del unnecessary blank

readme.md

@@ -129,10 +129,10 @@ goctl migrate —verbose —version v1.4.3
    ```shell
    # for Go 1.15 and earlier
    GO111MODULE=on go get -u github.com/zeromicro/go-zero/tools/goctl@latest
-   
+
    # for Go 1.16 and later
    go install github.com/zeromicro/go-zero/tools/goctl@latest
-   
+
    # For Mac
    brew install goctl
 
@@ -156,24 +156,24 @@ goctl migrate —verbose —version v1.4.3
      Request {
        Name string `path:"name,options=[you,me]"` // parameters are auto validated
      }
-   
+
      Response {
        Message string `json:"message"`
      }
    )
-   
+
    service greet-api {
      @handler GreetHandler
      get /greet/from/:name(Request) returns (Response)
    }
    ```
-   
+
    the .api files also can be generated by goctl, like below:
 
    ```shell
    goctl api -o greet.api
    ```
-   
+
 4. generate the go server-side code
 
    ```shell