Podspec update to 2.3.1
Podspec update to 2.3.1

xswm1123/DACircularProgress,AntiMoron/DACircularProgress,danielamitay/DACircularProgress,creationst/DACircularProgress,wanglongshuai/DACircularProgress,sujeking/DACircularProgress,zhuayi/DACircularProgress,sidorov-panda/DACircularProgress,CoderJFCK/DACircularProgress,drekka/DACircularProgress,jonesgithub/DACircularProgress,dawangjiaowolaixunshan/DACircularProgress,AzenXu/DACircularProgress,mluisbrown/DACircularProgress