fix astaxie#326

Author: astaxie

ebook/06.1.md

@@ -60,8 +60,8 @@ w表示需要写入的response，cookie是一个struct，让我们来看一下co
 
 我们来看一个例子，如何设置cookie
 
-	expiration := *time.LocalTime()
-	expiration.Year += 1
+	expiration := time.Now()
+	expiration = expiration.AddDate(1, 0, 0)
 	cookie := http.Cookie{Name: "username", Value: "astaxie", Expires: expiration}
 	http.SetCookie(w, &cookie)