Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-05-30 22:43 0827a30c

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feat(tactic/noncomm_ring): add noncomm_ring tactic (#2858) Fixes https://github.com/leanprover-community/mathlib/issues/2727

Estimated changes

added theorem bit0_mul
added theorem bit1_mul
added theorem mul_bit0
added theorem mul_bit1