readme tweaks
readme tweaks

vsimonian/xregexp,exexzian/xregexp,Akylas/xregexp,kod3r/xregexp,mathiasbynens/xregexp,Akylas/xregexp,cesarmarinhorj/xregexp,GerHobbelt/xregexp,GerHobbelt/xregexp,BeardandFedora/xregexp,imvijaybala/xregexp,slevithan/XRegExp,cesarmarinhorj/xregexp,sagarrakshe/xregexp,vsimonian/xregexp,mathiasbynens/xregexp,kod3r/xregexp,Iced-Tea/xregexp,slevithan/xregexp,slevithan/xregexp,mathiasbynens/xregexp,carabina/xregexp,mathiasbynens/xregexp,carabina/xregexp,Iced-Tea/xregexp,exexzian/xregexp,GerHobbelt/xregexp,slevithan/XRegExp,slevithan/xregexp,imvijaybala/xregexp,sagarrakshe/xregexp