Flesh out README a little more
Flesh out README a little more

iFixit/mailcatcher,CloCkWeRX/mailcatcher,TuffLuck/mailcatcher,MacroMackie/mailcatcher,intentmedia/mailcatcher-jruby,intentmedia/mailcatcher-jruby,globaldev/mailcatcher,excepttheweasel/mailcatcher,saisai/mailcatcher,Noxa/mailcatcher,okinaka/mailcatcher,SilverCG/mailcatcher,Noxa/mailcatcher,TuffLuck/mailcatcher,okinaka/mailcatcher,globaldev/mailcatcher,sj26/mailcatcher,MacroMackie/mailcatcher,sj26/mailcatcher,iFixit/mailcatcher,saisai/mailcatcher,SilverCG/mailcatcher