Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-19 22:45 706b4841

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chore(data/multiset): add a few lemmas (#4697)

Estimated changes

Modified src/data/multiset/basic.lean

added theorem multiset.count_cons

added theorem multiset.map_nsmul

added theorem multiset.sum_map_singleton