bookdown 0.14

NEW FEATURES

• Added rtf_document2 (thanks, @jooyoungseo, #768).

• Added copy to clipboard buttons to code blocks in the gitbook output format (thanks, @behrman #775, @RLesur #776).

BUG FIXES

• Images specified in toc: before: of the gitbook format are not copied to the output directory (thanks, @dcossyleon, #763).