docs(README.md): fix typo
docs(README.md): fix typo
NichenLg/showdown,stevemao/showdown,alazyer/showdown,phw/showdown,snegovick/showdown,OMGgogong/showdown,digideskio/showdown,xinshitn/showdown,stevemao/showdown,yaniswang/showdown,alazyer/showdown,showdownjs/showdown,webutilz/showdown,bsnizek/showdown,xinshitn/showdown,OMGgogong/showdown,phw/showdown,axter/showdown,pazof/showdown,bsnizek/showdown,digideskio/showdown,NichenLg/showdown,yaniswang/showdown,juanonsoftware/showdown,twitwi/showdown,showdownjs/showdown,twitwi/showdown,pazof/showdown,axter/showdown,coolroad/showdown,juanonsoftware/showdown,webutilz/showdown,coolroad/showdown,snegovick/showdown