Update ch1-04.md

2019-04-15 17:11:48 +08:00 · 2019-04-15 17:11:48 +08:00 · c47506f3eb
parent c0ef4470c7
commit c47506f3eb
1 changed files with 1 additions and 0 deletions
--- 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}