[README edited] Added UIColor list without preview
[README edited] Added UIColor list without preview

piercefreeman/HTPressableButton,qingpengchen2011/HTPressableButton,qingpengchen2011/HTPressableButton,qingpengchen2011/HTPressableButton,herinkc/HTPressableButton,piercefreeman/HTPressableButton,Famolus/HTPressableButton,Famolus/HTPressableButton,piercefreeman/HTPressableButton,Famolus/HTPressableButton,herinkc/HTPressableButton,herinkc/HTPressableButton