cd hackmd-0.5.0
patch -p1 < x.patch
mkdir public/vendor/abcjs/
wget https://raw.githubusercontent.com/paulrosen/abcjs/master/bin/abcjs_basic_2.3-min.js -O public/vendor/abcjs/abcjs_basic_2.3-min.js
Base: Hackmd 0.5.0 (https://github.com/hackmdio/hackmd/releases/tag/0.5.0)