v1.4.2

v1.4.2 of sl3 is a major release, featuring numerous updates to core functionality and improvements to available learners, including

• Updates to variable importance functionality, including calculation of risk ratio and risk differences under covariate deletion or permutation.
• Addition of a importance_plot to summarize variable importance findings.
• Additions of new methods reparameterize and retrain to Lrnr_base, which allows modification of the covariate set while training on a conserved task and prediction on a new task using previously trained learners, respectively.
• Updates to variable importance functionality, including use of risk ratios.
• Change Lrnr_hal9001 and Lrnr_glmnet to respect observation-level IDs.
• Removal of Remotes and deprecation of Lrnr_rfcde and Lrnr_condensier.