Update README.md

ogb_examples/linkproppred/ogbl-ppa/README.md

@@ -14,3 +14,5 @@ ogb
 ```
 CUDA_VISIBLE_DEVICES=0,1,2,3 python train.py --use_cuda 1  --num_workers 4 --output_path ./output/model_1 --batch_size 65536 --epoch 1000 --learning_rate 0.005  --hidden_size 256 
 ```
+
+The best record will be saved in ./output/model_1/best.txt.