Update app.py

app.py

@@ -95,7 +95,8 @@ def train_model():
   y_pred = model.predict(x_test)
   
   # save the model to file
-  pkl.dump(model, 'model.pkl')
+  with open('model.pkl, 'w+') as f:
+    pkl.dump(model, f)
 
 ### -------------------------------- ###
 ###            rerun logic           ###