Updated model type

I genuinely have no idea what kind of model they've used, but Haru said that his WD 1.4 model was trained on 2.1, so maybe this one too? I have to stop thinking about it too much.

README.md

@@ -29,7 +29,7 @@ A version of Waifu Diffusion v1.4 Float32 Booru 110k model and VAE from Waifu Di
 
 ## Model Description
 
-The current model has been fine-tuned on a Waifu Diffusion v1.3 model with 110k anime-styled images using a technique known as aspect ratio bucketing.
+The current model has been fine-tuned on a Stable Diffusion 2.1 model with 110k anime-styled images using a technique known as aspect ratio bucketing.
 
 That allows Waifu Diffusion v1.4 to handle different resolutions much better than its previous models.