Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-09-14 14:48 d5c58eb8

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chore(category_theory/*): make all forgetful functors use explicit arguments (#4139) As suggested as https://github.com/leanprover-community/mathlib/pull/4131#discussion_r487527599, for the sake of more uniform API.

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