message: Bump mdbook version
diff: @@ -3,7 +3,7 @@ set -euo pipefail
  # https://github.com/rust-lang-nursery/mdBook#installation
  main() {
  - local version="0.1.5"
  + local version="0.1.7"
  if command -v mdbook >/dev/null 2>&1; then
  if [[ $(mdbook --version) == "mdbook v$version" ]]; then
  