fixed typo

Author: jornbr

README.md

@@ -42,7 +42,7 @@ biogeochemistry and the ecosystem dynamics of the lower trophic levels.
 Geoscientific Model Development, 9(4), 1293–1339.
 doi: [10.5194/gmd-9-1293-2016](https://doi.org/10.5194/gmd-9-1293-2016).
 
-If you would like to refer to the FABM source code, you can do so by its Zenodo DOI:
+If you would like to refer to the ERSEM source code, you can do so by its Zenodo DOI:
 
 [![DOI](https://zenodo.org/badge/302390544.svg)](https://zenodo.org/badge/latestdoi/302390544)