Add go version to --version output (#1819)

Author: amirhasanzadehpy

version/string.go

@@ -3,7 +3,11 @@
 
 package version
 
-import "fmt"
+import (
+	"fmt"
+	"runtime"
+	"strings"
+)
 
 var (
 	// String is displayed when CLI arg --version is used
@@ -24,6 +28,13 @@ func init() {
 		format += ", commit=%s"
 		args = append(args, GitCommit)
 	}
+
+	// add golang version
+	goVersion := runtime.Version()
+	goVersionNumber := strings.TrimPrefix(goVersion, "go")
+	format += ", go=%s"
+	args = append(args, goVersionNumber)
+
 	format += "]\n"
 	String = fmt.Sprintf(format, args...)
 }