rustbook の "update-playpenjs" ブランチを使うよう circle.yml を変更する #159
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#158 (Rust コードに「Run」ボタンが表示されない)の原因となった rustbook crate の問題を rustbook 側で修正しました。修正版を使うために、circle.yml 内で指定している rustbook git レポジトリのブランチ名を修正します。
なお、rustbook を再インストールするために、CircleCI のキャッシュをクリアする必要があります。本 PR のマージ後に、Circle CI の UI からキャッシュのクリアを行います(参考)