RF: Removed unused 'pval' from modelling

src/ageml/modelling.py

@@ -291,7 +291,7 @@ def calculate_metrics(self, y_true, y_pred):
         MAE = metrics.mean_absolute_error(y_true, y_pred)
         rmse = metrics.mean_squared_error(y_true, y_pred, squared=False)
         r2 = metrics.r2_score(y_true, y_pred)
-        p, pval = stats.pearsonr(y_true, y_pred)
+        p, _ = stats.pearsonr(y_true, y_pred)
         return MAE, rmse, r2, p
 
     def summary_metrics(self, array):