Tim Yung b2179ebedf RN: Fix renderSeparator in ListView
Summary:
Couple fixes to `ListView`'s `renderSeparator`:

- Add a `key` by default.
- //Actually// avoid rendering the last separator.

Reviewed By: sahrens

Differential Revision: D4502732

fbshipit-source-id: 7502984cfb8652a22d8b85859e62ccf6e61c9b0e
2017-02-02 19:58:27 -08:00
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