Update `react-router-dom` libdef
Update `react-router-dom` libdef

Summary: Updated `react-router-dom` libdef because flow was complaining about `useHistory` hook not being exported

Test Plan: Flow no longer complains

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, palys-swm, Adrian

Differential Revision: https://phabricator.ashoat.com/D1616

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