v0.2.9

MLJTestInterface v0.2.9

Diff since v0.2.8

• Add some smoke tests for selected traits (#27)
• Add tests to catch inadvertent CategoricalArrays 1.0 breakages (#28)

Merged pull requests:

• Add trait smoke tests (#27) (@ablaom)
• Test classifier predictions for doubly wrapped CategoricalValue (#28) (@ablaom)
• For a 0.2.9 release (#29) (@ablaom)