mikropml 1.1.0

• New correlation method option for feature importance (#267, @courtneyarmour).
  • The default is still "spearman", and now you can use other methods supported by stats::cor with the corr_method parameter: get_feature_importance(corr_method = "pearson")
• There are now video tutorials covering mikropml and other skills related to machine learning, created by @pschloss (#270).
• Fixed a bug where preprocess_data() converted the outcome column to a character vector (#273, @kelly-sovacool, @ecmaggioncalda).