Fix the minor markup fix in README.
Fix the minor markup fix in README.

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