v0.13.9

Flux v0.13.9

Diff since v0.13.8

Closed issues:

• Iteration over params(m) in explicit mode gives no gradient (#2091)
• Flux.Optimise.update! updating grads instead of params? (#2121)
• Flux.reset! triggers a BoundsError (#2124)

Merged pull requests:

• Remove train! from quickstart example (#2110) (@mcabbott)
• Re-organise "built-in layers" section (#2112) (@mcabbott)
• Narrower version of @non_differentiable params (#2118) (@mcabbott)
• allow non-tuple data in the new train! (#2119) (@CarloLucibello)
• fix train! test (#2123) (@CarloLucibello)
• Move 5 tutorials from fluxml.github.io (#2125) (@mcabbott)
• Remove Flux.Data module (#2126) (@mcabbott)
• CompatHelper: bump compat for Functors to 0.4, (keep existing compat) (#2128) (@github-actions[bot])