Update mdbook to new version

This brings back playpen integration for the books.
rust-lang · Mar 10, 2017 · fdf48cd · fdf48cd
1 parent f91c3f6
commit fdf48cd
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Showing 2 changed files with 4 additions and 4 deletions.
diff --git a/src/Cargo.lock b/src/Cargo.lock
diff --git a/src/tools/rustbook/Cargo.toml b/src/tools/rustbook/Cargo.toml
@@ -8,5 +8,5 @@ license = "MIT/Apache-2.0"
 clap = "2.19.3"
 
 [dependencies.mdbook]
-version = "0.0.17"
+version = "0.0.18"
 default-features = false