From 67c1ed73ce5d4ddf2e70cfbe15166a7cba3751ea Mon Sep 17 00:00:00 2001
From: tink2123 <y_tink@163.com>
Date: Wed, 17 Oct 2018 18:25:16 +0800
Subject: [PATCH] update book submodule

---
 external/book | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/book b/external/book
index 9e9fa8e04..1685f6711 160000
--- a/external/book
+++ b/external/book
@@ -1 +1 @@
-Subproject commit 9e9fa8e04c221a54cfa83f017bb507bddf428615
+Subproject commit 1685f671181d37f5d9701a85bd925c34b8fef4bb
-- 
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