Update dependency wpackagist-theme/twentysixteen to v3.1 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentysixteen (source)	require	minor	3.0 -> 3.1

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Configuration

Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

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Ignore: Close this MR and you won't be reminded about this update again.

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