v0.8.14

NNlib v0.8.14

Diff since v0.8.13

Closed issues:

• support arbitrary number of batch dimensions in batched_mul (#451)

Merged pull requests:

• Add within_gradient (#434) (@mcabbott)
• Fixup docs for fold and unfold (#453) (@ToucheSir)
• Add dropout (#454) (@mcabbott)
• fast_maximum also for logsumexp (#456) (@Sleort)