Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-09-25 12:54 680f8771

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feat(data/rat/basic): coe_int_div, coe_nat_div (#4233) Snippet from the Witt project

Estimated changes

added theorem rat.coe_int_div
added theorem rat.coe_int_div_self
added theorem rat.coe_nat_div
added theorem rat.coe_nat_div_self