ggmemo - Add Arrows, Labels, and Change Annotations to 'ggplot2' Charts

Add callout arrows, highlight data points, and show percent change between rows on 'ggplot2' charts in one line of code. annotate_callout() points at a data row with an arrow and label. annotate_change() draws a color-coded arrow between two rows and labels the delta as percent change, absolute difference, or percentage points. Designed for business charts, quarterly reports, and dashboards. Built on top of the 'ggpp' package.