v0.8.4

MLJTuning v0.8.4

Diff since v0.8.3

• (enhancement) Implement feature importances that expose the feature importances of the optimal atomic model (#213)

Merged pull requests:

• add feature importances support for tuned models (#213) (@OkonSamuel)
• For a 0.8.4 release (#214) (@ablaom)