Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-11 20:09 952a407c

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feat(data/nat/digits): add norm_digits tactic (#4452) This adds a basic tactic for normalizing expressions of the form nat.digits a b = l. As requested on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/simplifying.20nat.2Edigits/near/212152395

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