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Commit 2019-04-08 17:11 ec51b6e1

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feat(category_theory/colimits): missing simp lemmas (#894)

Estimated changes

Modified src/category_theory/limits/limits.lean

added theorem category_theory.limits.colim.ι_map_assoc

added theorem category_theory.limits.colimit.ι_desc_assoc

added theorem category_theory.limits.colimit.ι_post_assoc

added theorem category_theory.limits.colimit.ι_pre_assoc