Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-04-11 04:27 597704ac

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chore(*): switch to lean 3.8.0 (#2361) Switch to Lean 3.8.

Estimated changes

modified theorem abs_le_abs
modified theorem min_add
modified theorem min_sub
modified theorem prod.map_fst
added theorem prod.map_mk
modified theorem prod.map_snd
modified def dummy
modified def right_param
modified def wrong_param