Fix typo in README.md

follwing -> following

README.md

@@ -91,7 +91,7 @@ Otherwise,
 - Refer to `./options/test` for the configuration file of the model to be tested, and prepare the testing data and pretrained model.  
 - The pretrained models are available at
 [Google Drive](https://drive.google.com/drive/folders/1HpmReFfoUqUbnAOQ7rvOeNU3uf_m69w0?usp=sharing) or [Baidu Netdisk](https://pan.baidu.com/s/1u2r4Lc2_EEeQqra2-w85Xg) (access code: qyrl).  
-- Then run the follwing codes (taking `HAT_SRx4_ImageNet-pretrain.pth` as an example):
+- Then run the following codes (taking `HAT_SRx4_ImageNet-pretrain.pth` as an example):
 ```
 python hat/test.py -opt options/test/HAT_SRx4_ImageNet-pretrain.yml
 ```