Fix readme.md text
Fix readme.md text

maxdow/nsPopover,BetterWorks/nsPopover,maxdow/nsPopover,silentlagoon/nsPopover,gabehayes/nsPopover,mavencare/nsPopover,Envoc/nsPopover,zpzgone/nsPopover,gabehayes/nsPopover,nohros/nsPopover,zpzgone/nsPopover,nohros/nsPopover,silentlagoon/nsPopover,britter/nsPopover,mavencare/nsPopover,BetterWorks/nsPopover,britter/nsPopover