Update docs

Author: Stefan Hahmann

README.md

@@ -354,6 +354,8 @@ The plugin allows performing various operations based on the correspondence info
 * Menu Location: `Plugins > Lineage analysis > Show spot and division counts over time`
 * The command shows a plot of the number of spots and divisions over time.
 * It is possible to set a window size, which is used to compute a sliding average.
+* Colors, visibilities, and sliding average windows size can be set in the plot and are persisted as user preference
+* A context menu allows to export the plot as a PNG/SVG file.
 * A division is defined as a spot with more than one outgoing edge.
 * Example: ![spot_and_division_counts_over_time.png](doc/lineageanalysis/spot_and_division_counts_over_time.png)