Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2018-12-17 11:35 b7d74c43

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feat(data/list): list.chain' for empty chains

Estimated changes

added theorem list.chain'.iff
added theorem list.chain'.iff_mem
added theorem list.chain'.imp
added theorem list.chain'_map
added theorem list.chain'_singleton
added theorem list.chain'_split
modified theorem list.chain.iff_mem
modified theorem list.nodup_nil