Merge pull request #60 from lyyyuna/goc-auto-version

support goc version using `go get`

cmd/version.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"fmt"
+	"runtime/debug"
 
 	"github.com/spf13/cobra"
 )
@@ -33,7 +34,15 @@ var versionCmd = &cobra.Command{
 goc version
 	`,
 	Run: func(cmd *cobra.Command, args []string) {
+		// if it is "Unstable", means user build local or with go get
+		if version == "Unstable" {
+			if info, ok := debug.ReadBuildInfo(); ok {
+				fmt.Println(info.Main.Version)
+			}
+		} else {
+			// otherwise the value is injected in CI
 			fmt.Println(version)
+		}
 	},
 }