Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-07-17 09:26 4a6b7168

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fix(tactic/nlinarith): stop nlinarith failing in the presence of squares when there is no order (#3417) As reported by Heather Macbeth at https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/app_builder_exception.20in.20.60nlinarith.60/near/204138256

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