Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-05-10 00:45 81f97bdf

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chore(*): move to lean-3.11.0 (#2632) Related Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/lean.23211.20don't.20unfold.20irred.20defs

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