Update .yardopts to markdown
Update .yardopts to markdown

Update .yardopts file to reflect new use of markdown in docs.

porras/sinatra,kyontan/sinatra,cyberid41/sinatra,burningTyger/sinatra,autopp/sinatra,laplaceliu/sinatra,eileencodes/sinatra,guidohcosta/sinatra,guidohcosta/sinatra,midorineko/sinatra,emiliocorpus/sinatra,lastcat/sinatra,howtolearntocode/sinatra,kumji/sinatra,kumji/sinatra,Wirachmat/sinatra,sinatra/sinatra,ganmacs/sinatra,defsprite/sinatra,dariubs/sinatra,RosenDimov/sinatra,QLGu/sinatra,cyberid41/sinatra,kgrz/sinatra,porras/sinatra,ganmacs/sinatra,RosenDimov/sinatra,d-bot/sinatra,burningTyger/sinatra,sethuster/sinatra,Rayheng/sinatra,d-bot/sinatra,emiliocorpus/sinatra,sethuster/sinatra,davydovanton/sinatra,ktw1222/sinatra,jkowens/sinatra,mwpastore/sinatra,dariubs/sinatra,burningTyger/sinatra,mwpastore/sinatra,Wirachmat/sinatra,lastcat/sinatra,midorineko/sinatra,ryanshaw/sinatra,JonMidhir/sinatra,wzheng1/sinatra,nicoayala/sinatra,marocchino/sinatra,frechei/sinatra,DoraALin/sinatra,kyontan/sinatra,siberianbear/sinatra,laplaceliu/sinatra,ryanshaw/sinatra,ksw2599/sinatra,ABaldwinHunter/sinatra-classic,JonMidhir/sinatra,sinatra/sinatra,howtolearntocode/sinatra,mwpastore/sinatra,nju520/sinatra,Rayheng/sinatra,ABaldwinHunter/sinatra-classic,miyazawatomoka/sinatra,trexnix/sinatra,jenalgit/sinatra,jkowens/sinatra,nicoayala/sinatra,ksw2599/sinatra,jenalgit/sinatra,miyazawatomoka/sinatra,JonMidhir/sinatra,gferguson-gd/sinatra,davydovanton/sinatra,DoraALin/sinatra,jkowens/sinatra,JonRowe/sinatra,siberianbear/sinatra,frechei/sinatra,JonRowe/sinatra,wzheng1/sinatra,ktw1222/sinatra,eileencodes/sinatra,QLGu/sinatra,defsprite/sinatra,nju520/sinatra,autopp/sinatra,gferguson-gd/sinatra,trexnix/sinatra