增加mac下修改host工具介绍
增加mac下修改host工具介绍

racaljk/hosts,Xiejiayun/hosts,lifenglsf/hosts,VegetaPn/hosts,gavin-gui/hosts,ruidalin/hosts,lifenglsf/hosts,wsdjeg/hosts,Xiejiayun/hosts,lifenglsf/hosts,Xiejiayun/hosts,gavin-gui/hosts,coolrc136/hosts