Update README.md

README.md

@@ -201,7 +201,7 @@ then load, featurize, split, fit, and evaluate the catboost model
 
 
 ### Data splits
-Here we have used the Realistic Split method described in (Martin et al., 2018).
+Here we have used the Realistic Split method described in [(Martin et al., 2018)](https://doi.org/10.1021/acs.jcim.7b00166)
 
         
 ## AttentiveSkin