Breaks production builds in RN 0.49.1

[joncursi]

In RN 0.49.1 apps, when DEV is false, this happens:

Cause of the issue: https://github.com/gitim/react-native-sortable-list/blob/master/src/SortableList.js#L20-L21

[gitim]

released fix in 0.0.18