fix: fix link to zca docs

app.py

@@ -31,7 +31,7 @@ def predict(images, eps):
 title = 'ZCA Whitening with Kornia!'
 description = '''[ZCA Whitening](https://paperswithcode.com/method/zca-whitening) is an image preprocessing method that leads to a transformation of data such that the covariance matrix is the identity matrix, leading to decorrelated features:
 *Note that you can upload only image files, e.g. jpg, png etc and there should be at least 2 images!* 
-Learn more about [ZCA Whitening and Kornia](https://kornia.readthedocs.io/en/latest/_modules/kornia/enhance/zca.html)'''
+Learn more about [ZCA Whitening and Kornia](https://kornia.readthedocs.io/en/v0.6.4/_modules/kornia/enhance/zca.html)'''
 
 with gr.Blocks(title=title) as demo:
     gr.Markdown(f"# {title}")