Expanded README with a `Requirements` section.
Expanded README with a `Requirements` section.

AbooJan/PKRevealController,hanangellove/PKRevealController,pengleelove/PKRevealController,policp/PKRevealController,adonoho/PKRevealController,libiao88/PKRevealController,wayne798/PKRevealController,SummerHF/PKRevealController,wubangjunjava/PKRevealController,wpostma/PKRevealControllerWP,pkluz/PKRevealController,cnbin/PKRevealController,AlanJN/PKRevealController,adonoho/PKRevealController,chieryw/PKRevealController,adonoho/PKRevealController,SanChain/PKRevealController,xingyuniu/PKRevealController,wjszf/PKRevealController,emodeqidao/PKRevealController,BlessNeo/PKRevealController,RyanTech/PKRevealController,chengkaizone/PKRevealController,SuPair/PKRevealController,leasual/PKRevealController,andyFang1688/PKRevealController,nitxc/PKRevealController,ramoslin02/PKRevealController,xiaotaijun/PKRevealController,duanhjlt/PKRevealController