Update README.md

Author: takekan

README.md

@@ -49,7 +49,7 @@ https://doi.org/10.1007/s10683-006-9159-4.
 
 Takeuchi, K. (2022). ztree2stata: A data converter for z-Tree and Stata users. (*Journal of the Economic Science Association*, R&R.)
 
-I would appreciate it if you kindly mention to this code in a footnote (or you can add this to the list of references).
+I would appreciate it if you kindly mention to this code in a footnote or somewhere.
 
 Takeuchi, Kan. (2022). ztree2python.py, http://github.com/takekan/ztree2python.