Update podspec to 2.2.1.
Update podspec to 2.2.1.
KBvsMJ/MarqueeLabel,cbpowell/MarqueeLabel,RacZo/MarqueeLabel,yunzhongyoulong/MarqueeLabel,cbpowell/MarqueeLabel,suchitabohra/MarqueeLabel,litt1e-p/MarqueeLabel,ByunghooLim/MarqueeLabel,zmcadam/MarqueeLabel,ihello/MarqueeLabel