0.4.0

• feat: support different palettes/palcolors for subplots by 'split_by' (#4)
• fix: rename 'add_lines' to 'add_bars' in CorPairsPlot (#6)
• docs: fix multiple palcolor example for ScatterPlot
• feat: support named palcolor and keep the order (pwwang/scplotter#12)
• feat: init tests
• feat: add ROCCurve
• docs: update documentation for split_by and palette/palcolor in basic-design
• docs: make logo bigger
• feat: Add support for the positive class label (pos_label) in ROCCurve functions
• feat: support facet_by for cutoff points and add support for special cutoff points for ROCCurve
• feat: put AUC values always on the less crowded area for ROCCurve
• feat: support comparisons = TRUE when group_by is NULL for Box/Violin plot
• feat: add scale_y argument to BarPlot to scale total y to 100%
• chore: adjust height calculation in BarPlot for better label fitting