update book submodule

67c1ed73 · tink2123 · 846f4481 · 1685f671 · 9e9fa8e0 · 1685f671
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Showing with 1 addition and 1 deletion

external/book external/book +1 -1

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--- a/book @ 1685f671
+++ b/book @ 1685f671
-Subproject commit 9e9fa8e04c221a54cfa83f017bb507bddf428615
+Subproject commit 1685f671181d37f5d9701a85bd925c34b8fef4bb