Change += and -= to use inPlace ops and += should be union
Change += and -= to use inPlace ops and += should be union

fhchina/SnapKit,zhaoguohui/SnapKit,dawangjiaowolaixunshan/SnapKit,sai43/SnapKit,ernestopino/SnapKit,HackRoy/SnapKit,CoderJFCK/SnapKit,zht415/SnapKit,imjerrybao/SnapKit,dawangjiaowolaixunshan/SnapKit,zilaiyedaren/SnapKit,HackRoy/SnapKit,brittonmobile/SnapKit,398539445/SnapKit,sai43/SnapKit,fhchina/SnapKit,ernestopino/SnapKit,Rdxer/SnapKit,brittonmobile/SnapKit,CoderJFCK/SnapKit,duanhjlt/SnapKit,zhaoguohui/SnapKit,loupman/SnapKit,SnapKit/SnapKit,zilaiyedaren/SnapKit,SnapKit/SnapKit,398539445/SnapKit,Rdxer/SnapKit,imjerrybao/SnapKit,zht415/SnapKit,duanhjlt/SnapKit,loupman/SnapKit