SchlossLab/mikropml: mikropml 1.3.0

mikropml now requires R version 4.1.0 or greater due to an update in the randomForest package (#292). New function compare_models() compares the performance of two models with a permutation test (#295, @courtneyarmour). Fixed a bug where cv_times did not affect the reported repeats for cross-validation (#291, @kelly-sovacool). Made minor documentation improvements (#293, @kelly-sovacool) Full Changelog: https://github.com/SchlossLab/mikropml/compare/v1.2.2...v1.3.