Update to mdbook 0.2.1 (#482)

CONTRIBUTING.md

@@ -20,7 +20,7 @@ cd rust-cookbook
 Cookbook is built with [mdBook], so install that first with Cargo:
 
 ```
-cargo install --version 0.1.8 mdbook
+cargo install mdbook --vers "0.2.1"
 ```
 
 To build and view the cookbook locally, run:

README.md

@@ -21,7 +21,7 @@ If you'd like to read it locally:
 ```bash
 $ git clone https://github.com/rust-lang-nursery/rust-cookbook
 $ cd rust-cookbook
-$ cargo install mdbook --vers "0.1.8"
+$ cargo install mdbook --vers "0.2.1"
 $ mdbook serve --open
 ```
 

book.toml

@@ -9,7 +9,7 @@ src = "src"
 [output.html]
 mathjax-support = false
 theme = "theme"
-additional-css = ["theme/custom.css"]
+additional-css = ["src/theme/custom.css"]
 
 [output.html.playpen]
 editable = false

ci/install_deps.sh

@@ -18,7 +18,7 @@ if [[ "${CONTENT_TESTS:-}" == 1 ]]; then
         pyenv local 3.6.0
         pip3 install --user link-checker==0.1.0
     fi
-    cargo install mdbook --vers '0.1.8' --debug
+    cargo install mdbook --vers '0.2.1' --debug
 fi
 
 exit 0