Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-07-08 10:26 fbb49cbe

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refactor(*): place map_map in the functor namespace (#3309) Renames _root_.map_map to functor.map_map and filter.comap_comap_comp to filter.comap_comap (which is consistent with filter.map_map).

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