Fix AS warnings of "Unused property"
Fix AS warnings of "Unused property"

vinayak-garg/android-advancedrecyclerview,IgorGanapolsky/android-advancedrecyclerview,pranavlathigara/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview,0359xiaodong/android-advancedrecyclerview,ValentinTan/android-advancedrecyclerview,mluedke2/android-advancedrecyclerview,murugespandian/android-advancedrecyclerview,kkalass/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview,first087/android-advancedrecyclerview,HKMOpen/android-advancedrecyclerview,tieusangaka/android-advancedrecyclerview,vevo-kevin-kawai/android-advancedrecyclerview,tankcong/android-advancedrecyclerview,kprathap23/android-advancedrecyclerview,SeanSStewart/android-advancedrecyclerview,md5555/android-advancedrecyclerview,thefex/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview,sergioMendoza/android-advancedrecyclerview,chengkaizone/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview,Lakkichand/advancedrecyclerview,MaTriXy/android-advancedrecyclerview,jackyglony/android-advancedrecyclerview,DuongNTdev/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview