update book submodule

5974118c · tink2123 · e2ec8090 · 9e9fa8e0 · 0d602dbb · 9e9fa8e0
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external/book external/book +1 -1

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--- a/book @ 9e9fa8e0
+++ b/book @ 9e9fa8e0
-Subproject commit 0d602dbbd390b95554fe6794d46f4a0c6c121179
+Subproject commit 9e9fa8e04c221a54cfa83f017bb507bddf428615