Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-07-19 15:29 9b0435a0

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fix(tactic/linarith): find correct zero_lt_one (#3455) Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/linarith.20and.20ordinal.20file

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