Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-08-26 07:01 6c6fc021

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feat(data/fin): cast_add_right (#8829)

Estimated changes

Modified src/data/fin.lean

added def fin.cast_add_right

added theorem fin.coe_cast_add_right

added theorem fin.le_cast_add_right