Update podspec.
Update podspec.

cbpowell/MarqueeLabel,ihello/MarqueeLabel,KBvsMJ/MarqueeLabel,litt1e-p/MarqueeLabel,zmcadam/MarqueeLabel,suchitabohra/MarqueeLabel,yunzhongyoulong/MarqueeLabel,cbpowell/MarqueeLabel,RacZo/MarqueeLabel,ByunghooLim/MarqueeLabel