update book submodule

a81163c7 · tink2123 · 3623d6ad · da161514 · f5e6bfa8 · da161514
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Showing with 1 addition and 1 deletion

external/book external/book +1 -1

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--- a/book @ da161514
+++ b/book @ da161514
-Subproject commit f5e6bfa8346a96d013bc04d14570a27ab2f7f613
+Subproject commit da1615146f1c460b2602c69a9512d656d4a85baf