add remake in readme

README.md

@@ -5,6 +5,9 @@ Based on harmonized NFI data from Mauri et al. (2017), with climatic data extrac
 http://www.cgiar-csi.org/data/global-aridity-and-pet-database
 http://www.cgiar-csi.org/data/global-high-resolution-soil-water-balance
 
+The analysis are done using the R package remake see https://github.com/richfitz/remake to facilitate replicability.
+
+
 # References
 
 Mauri, Achille, Giovanni Strona, and Jesús San-Miguel-Ayanz 2017EU-Forest, a High-Resolution Tree Occurrence Dataset for Europe. Scientific Data 4: 160123.