Add a mention about pre API level v14 on README
Add a mention about pre API level v14 on README

MaTriXy/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview,h6ah4i/android-advancedrecyclerview,MaTriXy/android-advancedrecyclerview