v0.5.17

Zygote v0.5.17

Diff since v0.5.16

Closed issues:

• Column vectors work but row vectors fail (#331)
• BUG: Array indexing with list comprehensions (#766)

Merged pull requests:

• move NNlib rules out of Zygote (#824) (@simeonschaub)
• Adjoint for broadcasting A .+-* Bool (#838) (@mcabbott)
• Remove LoopVectorization.jl (#842) (@mcabbott)
• Dispatch on AContext (#844) (@willtebbutt)
• Add missing dispatch for pmap (#845) (@ChrisRackauckas)