FlexibleAdapter#removeAllScrollableFooters() seems to notify incorrect item range

[kvolkers]

v5.0.0-rc1
https://github.com/davideas/FlexibleAdapter/blob/master/flexible-adapter/src/main/java/eu/davidea/flexibleadapter/FlexibleAdapter.java#L909

I think this line should be changed from:
notifyItemRangeRemoved(getItemCount() - 1 - mScrollableHeaders.size(), mScrollableFooters.size());
to:
notifyItemRangeRemoved(getItemCount() - mScrollableFooters.size(), mScrollableFooters.size());

Calling removeAllScrollableFooters() for these example items:
0 - Scrollable Header
1 - Scrollable Header
2 - Content Item
3 - Content Item
4 - Scrollable Footer

notifyItemRangeRemoved(2, 1) is called
getItemCount() => 5, minus 1 and minus 2 for mScrollableHeaders.size()

when I think it should be notifyItemRangeRemoved(4, 1)

[davideas]

@kvolkers, yes, you're right, I'll fix it asap and initially publish as snapshot version.