Fix unsigned integer overflow

[tuoxie007]

Changes in this pull request

Issue fixed: #

Checklist

• [x] All tests pass. Demo project builds and runs.
• [ ] I added tests, an experiment, or detailed why my change isn't tested.
• [x] I added an entry to the CHANGELOG.md for any breaking changes, enhancements, or bug fixes.
• [x] I have reviewed the contributing guide

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[iglistkit-bot]

	1 Warning
:warning:	All pull requests should have a milestone attached, unless marked #trivial.

Generated by :no_entry_sign: Danger

[lorixx]

ummm @tuoxie007 r u still merging this PR? thanks

[lorixx]

@tuoxie007 can you sign the CLA? thanks

[lorixx]

@tuoxie007 can you sign the CLA? thanks

[tuoxie007]

@tuoxie007 can you sign the CLA? thanks

Sorry for late, done for cla.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[lorixx]

Thank you @tuoxie007 Jason, can you rebase and update the PR w/ the latest master? thx

[facebook-github-bot]

@tuoxie007 has updated the pull request. Re-import the pull request

[facebook-github-bot]

@tuoxie007 has updated the pull request. You must reimport the pull request before landing.

[facebook-github-bot]

@TimOliver merged this pull request in Instagram/IGListKit@164f39c4d4a1158c0e1514dab77f42b353b5c49a.