README typo fix
README typo fix

mickey/videojs-ga,Afrostream/videojs-ga,BrightcoveOS/videojs-ga-videocloud,mickey/videojs-ga,utlib/videojs-ga,utlib/videojs-ga,seescode/videojs-ga-videocloud,Afrostream/videojs-ga,mister-ben/videojs-ga-videocloud,azine/videojs-analytics,azine/videojs-analytics