Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-02-25 22:59 6a6beaa7

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chore(data/list/basic): drop append_foldl and append_foldr, add map_nil and prod_singleton (#2057) append_foldl and append_foldr were unused duplicates of foldl_append and foldr_append

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