Update changelog. Replaces #532
Update changelog. Replaces #532

Summary:
Update changelog. Replaces #532
Closes https://github.com/Instagram/IGListKit/pull/535

Reviewed By: rnystrom

Differential Revision: D4684643

Pulled By: jessesquires

fbshipit-source-id: 0d9c0bda6ab43894d5c297e957afbcd1fbfdc9b5

zhubofei/IGListKit,Instagram/IGListKit,zhubofei/IGListKit,zhubofei/IGListKit,zhubofei/IGListKit,Instagram/IGListKit,Instagram/IGListKit,Instagram/IGListKit,zhubofei/IGListKit,Instagram/IGListKit