Update podspev version to 1.3.1
Update podspev version to 1.3.1

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