added beeswarmplot option

Tridimensional barplots in R/README.md

@@ -82,3 +82,11 @@ ggsave("mybarplot.pdf", width=8, height=5, units="cm")
 The result will need further adjustments, in Inkscape, for example for the final figure:
 
 ![Obtained plot](<./savedplot.png> "Obtained plot")
+
+UPDATE (sept 2023) - a more pleasant distribution of points could be obtained using the "beeswarm" plots, in which the dots are distributed depending on their density. One need just to replace the `geom_point(... position_jitterdodge)` with something similar to this:
+```R
+geom_quasirandom(data=melted, aes(x=vector, y=value, color=factor(strain)), 
+                                dodge.width = 0.8,
+                                shape=21, fill="white")+
+```
+`ggbeeswarm` can be installed from CRAN (https://github.com/eclarke/ggbeeswarm)
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