Update MarqueeLabel copyright date in README.
Update MarqueeLabel copyright date in README.

mohsinalimat/LNPopupController,aklokov-iOS/LNPopupController,sunfei/LNPopupController,Ezimetzhan/LNPopupController,RyanTech/LNPopupController,augmify/LNPopupController,augmify/LNPopupController,maxprig/LNPopupController,LeoNatan/LNPopupController,mohsinalimat/LNPopupController,Ezimetzhan/LNPopupController,xuanyi0627/LNPopupController,iosdevvivek/LNPopupController,e-tipalchuk/LNPopupController,iosdevvivek/LNPopupController,Pingco/LNPopupController,LeoNatan/LNPopupController,colemancda/LNPopupController,xuanyi0627/LNPopupController,carabina/LNPopupController,carabina/LNPopupController,LeoNatan/LNPopupController,msdgwzhy6/LNPopupController,RyanTech/LNPopupController,ichu501/LNPopupController,hieutn/LNPopupController,WDraper/LNPopupController,sunfei/LNPopupController,WDraper/LNPopupController,msdgwzhy6/LNPopupController,aklokov-iOS/LNPopupController,ichu501/LNPopupController,hieutn/LNPopupController,MosheBerman/LNPopupController,MosheBerman/LNPopupController,colemancda/LNPopupController,FelixMLians/LNPopupController,Pingco/LNPopupController,FelixMLians/LNPopupController,e-tipalchuk/LNPopupController,maxprig/LNPopupController