v0.4.0

Functors v0.4.0

Diff since v0.3.0

Closed issues:

• Should Flux.destructure be moved to Functors.jl (#5)
• Add more Base types (#28)

Merged pull requests:

• Return empty NamedTuple in @functor instead of empty Tuple (#36) (@ToucheSir)
• Use the cache less often (#39) (@mcabbott)
• Separate walks out from fmap and add #39 to fcollect (#43) (@darsnack)
• Documentation tweaks (#44) (@mcabbott)
• Add more base types (#47) (@mcabbott)
• Change getproperty to getfield (#48) (@mcabbott)
• Revert "Change getproperty to getfield (#48)" (#50) (@mcabbott)