Re-added renderItem type definition
Re-added renderItem type definition

Internally the SwipeListView component passes a `RowMap`(see https://github.com/jemise111/react-native-swipe-list-view/blob/e16ad2fd0fc96f5cd645ea4720890c926cd1f0a0/components/SwipeListView.js#L202) but for some reason this line was commented without any explanation. This is still useful for people that are manually implementing `SwipeRow`, like me.

May sound egoistical but I don't see any negative side effects of having this on.
jemise111/react-native-swipe-list-view,jemise111/react-native-swipe-list-view,jemise111/react-native-swipe-list-view