Update Readme for v1.2.1
Update Readme for v1.2.1

LinKingR/android-pull-to-refresh,Ranjan101/android-pull-to-refresh,toker/android-pull-to-refresh,androidjhent/naver,handstudio/android-pull-to-refresh,wskplho/android-pull-to-refresh,androidjhent/naver.v2,naver/android-pull-to-refresh,Ranjan101/android-pull-to-refresh,wskplho/android-pull-to-refresh