Update README.md

Changed a grammatical error to further reflect the true context.

README.md

@@ -58,7 +58,7 @@ In addition make sure to install `transformers`, `safetensors`, `accelerate` as
 pip install invisible_watermark transformers accelerate safetensors
 ```
 
-Yon can then use the refiner to improve images.
+You can then use the refiner to improve images.
 
 ```py
 import torch