v0.9.0

LossFunctions v0.9.0

Diff since v0.8.1

Closed issues:

• No difference between WeightedMean and WeighedSum when normalize=false (#149)
• Revisiting MLJ <-> LossFunctions.jl integration (#157)

Merged pull requests:

• Remove ObsDim to generalize the code for iterables of observations (#158) (@juliohm)
• Revert order of arguments (#159) (@juliohm)