add markdown code block syntax highlighting
add markdown code block syntax highlighting

patnolanireland/dotfiles,nicknisi/dotfiles,fieteboerner/dotfiles,gblock0/dotfiles_unstable,nicknisi/dotfiles,Reesi82/dotfiles,ptgamr/dotfiles,neutrinog/dotfiles,ptgamr/dotfiles,jacobxk/dotfiles-1,paulhirschi/dotfiles,zhenglaizhang/dotfiles-1,fieteboerner/dotfiles,jbargu/dotfiles,Jooho/dotfiles_mac,bbtb1982/dotfiles,damca/dotfiles-ubuntu,SlyDen/dotfiles,jacobxk/dotfiles-1,zhenglaizhang/dotfiles-1,pekosi/dotfiles,OctavianRotari/dotfiles,jbargu/dotfiles,pekosi/dotfiles,OctavianRotari/dotfiles,Boukefalos/dotfiles,damca/dotfiles-ubuntu,joeandrews/dotfiles,patnolanireland/dotfiles,Jooho/dotfiles_mac,nicknisi/dotfiles,abhisood/dotfiles,bbtb1982/dotfiles,dyong0/dotfiles,NerdPad/dotfiles,fieteboerner/dotfiles