Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-03-17 19:18 6e1143ab

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chore(combinatorics/simple_graph): remove bad simp attribute (#6736) As in https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/symmetry.20fails.20if.20simple.20graph.20is.20imported.

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