Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-11-09 09:20 86146152

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refactor(data/nat/interval): simp for Ico_zero_eq_range (#10211) This PR makes two changes: It refactors nat.Ico_zero_eq_range from Ico 0 a = range a to Ico 0 = range, and makes the lemma a simp lemma. These changes feel good to me, but feel free to close this if this is not the direction we want to go with this lemma.

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