docs: update goctl installation command (#1403)

readme-cn.md

@@ -104,10 +104,10 @@ GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/
 
     ```shell
     # Go 1.15 及之前版本
-    GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl@cli
+    GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl@latest
     
     # Go 1.16 及以后版本
-    GOPROXY=https://goproxy.cn/,direct go install github.com/tal-tech/go-zero/tools/goctl@cli
+    GOPROXY=https://goproxy.cn/,direct go install github.com/tal-tech/go-zero/tools/goctl@latest
     ```
 
     确保 goctl 可执行

readme.md

@@ -107,10 +107,10 @@ go get -u github.com/tal-tech/go-zero
 
    ```shell
    # for Go 1.15 and earlier
-   GO111MODULE=on go get -u github.com/tal-tech/go-zero/tools/goctl@cli
+   GO111MODULE=on go get -u github.com/tal-tech/go-zero/tools/goctl@latest
    
    # for Go 1.16 and later
-   go install github.com/tal-tech/go-zero/tools/goctl@cli
+   go install github.com/tal-tech/go-zero/tools/goctl@latest
    ```
 
    make sure goctl is executable.

tools/goctl/upgrade/upgrade.go

@@ -9,11 +9,11 @@ import (
 )
 
 // Upgrade gets the latest goctl by
-// go get -u github.com/tal-tech/go-zero/tools/goctl
+// go install github.com/tal-tech/go-zero/tools/goctl@latest
 func Upgrade(_ *cli.Context) error {
-	cmd := `GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go install github.com/tal-tech/go-zero/tools/goctl@cli`
+	cmd := `GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go install github.com/tal-tech/go-zero/tools/goctl@latest`
 	if runtime.GOOS == "windows" {
-		cmd = `set GOPROXY=https://goproxy.cn,direct && go install github.com/tal-tech/go-zero/tools/goctl@cli`
+		cmd = `set GOPROXY=https://goproxy.cn,direct && go install github.com/tal-tech/go-zero/tools/goctl@latest`
 	}
 	info, err := execx.Run(cmd, "")
 	if err != nil {