tidycomp 0.3.0

• Package supports unpaired 2-group comparisons using: Student's t-test, Welch's t-test, and Mann-Whitney U test.
• Package supports multiple unpaired group comparisons using: ANOVA, Welch's ANOVA, and Kruskal-Wallis test.
• Package supports repeated measures Anova via afex::aov_ez() and Friedman's test.
• Added engine-specific effect size calculations.
• Added multiple outlier detection methods, e.g. step_trim_outliers() now supports method = "iqr", "mad", or "sd" (all default to k = 3), following guidance from the r4np book.
• Documentation for all functions has been added/updated/tidied.
• comp_spec() fixed issues with missing specifications.
• report_comp_result() returns correct results.
• README.md has been updated to include a link to the Contributor Code of Conduct.