Update README.md

Author: wanteatfruit

README.md

@@ -69,5 +69,5 @@ Please cite the following if you use CodeGRITS in your research.
 
 ## Contact us
 
-Please feel free to contact Ningzhi Tang at ntang@nd.edu or Junwen An at jan2@nd.edu
-if you have any questions or suggestions.
+Please feel free to contact Ningzhi Tang at ntang@nd.edu or Junwen An at jan2@nd.edu/feasiblechart@gmail.com
+if you have any questions or suggestions.