Fix markdown error in AUTHORS file
Fix markdown error in AUTHORS file

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