update README with 1.2.4 changelog
update README with 1.2.4 changelog

songjinshi/RoundedImageView,msdgwzhy6/RoundedImageView,stateofzhao/RoundedImageView,GeorgeMe/RoundedImageView,confile/RoundedImageView,juoni/RoundedImageView,xzxevil/RoundedImageView,TobbHuang/RoundedImageView,jon-adams/RoundedImageView,perrystreetsoftware/RoundedImageView,xfshipan/RoundedImageView,zhuxiaohao/RoundedImageView,ptornhult/RoundedImageView,net19880504/RoundedImageView,caobaibing/RoundedImageView,tanweijiu/RoundedImageView,IsFei/RoundedImageView,murat8505/RoundedImageView,MaTriXy/RoundedImageView,wutianlong/RoundedImageView,kuldeep199221/RoundedImageView,kyanro/RoundedImageView,wangziqiang/RoundedImageView,launk/RoundedImageView,YlJava110/RoundedImageView,razzlakki/RoundedImageView