From ac78a85ad613b1ec12a07178d0c5a95f7a13218e Mon Sep 17 00:00:00 2001
From: tink2123 <y_tink@163.com>
Date: Tue, 16 Oct 2018 17:15:37 +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 0d602dbbd..9e9fa8e04 160000
--- a/external/book
+++ b/external/book
@@ -1 +1 @@
-Subproject commit 0d602dbbd390b95554fe6794d46f4a0c6c121179
+Subproject commit 9e9fa8e04c221a54cfa83f017bb507bddf428615
-- 
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