From c47506f3eb4eba63b05d291f9336e42ad0260a9e Mon Sep 17 00:00:00 2001
From: ShiCheng <nnecec@outlook.com>
Date: Mon, 15 Apr 2019 17:11:48 +0800
Subject: [PATCH] Update ch1-04.md

---
 ch1/ch1-04.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ch1/ch1-04.md b/ch1/ch1-04.md
index 314ec8e..8456985 100644
--- a/ch1/ch1-04.md
+++ b/ch1/ch1-04.md
@@ -23,6 +23,7 @@ import (
 	"math"
 	"math/rand"
 	"os"
+	"time"
 )
 
 var palette = []color.Color{color.White, color.Black}