Use `singleton_class` in lieu of class << self
Use `singleton_class` in lieu of class << self

sinatra/sinatra,JonMidhir/sinatra,ryanshaw/sinatra,burningTyger/sinatra,ryanshaw/sinatra,mwpastore/sinatra,jkowens/sinatra,mwpastore/sinatra,sinatra/sinatra,burningTyger/sinatra,mwpastore/sinatra,jkowens/sinatra,JonMidhir/sinatra,JonMidhir/sinatra,jkowens/sinatra,burningTyger/sinatra