Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-08-17 17:33 f8bf0016

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fix(ring_theory/localization): remove coe_submodule instance (#3832) This coe can loop. See zulip discussion at https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Unknown.20error.20while.20type-checking.20with.20.60use.60/near/207089095

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