Rollup merge of #40732 - petrochenkov:booktidy, r=steveklabnik

Update the book submodule and fix tidy

When the book was included into https://github.com/rust-lang/rust as a submodule, tidy started failing on Windows.
https://github.com/rust-lang/book/pull/549 fixed the problem, now the submodule needs to be updated.
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Corey Farwell 2017-03-22 19:30:35 -04:00 committed by GitHub
commit 0e57709161
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Subproject commit e6d6caab41471f7115a621029bd428a812c5260e
Subproject commit 9bd223ca406b1170a24942d6474f9e8a56f4a420