update library tag to `transformers`

Heya! I see that you have the `diffusers` library tag in place, however since diffusers does not implement CLIP encoders but rather uses the `transformers` implementation it's better to change the library tag accordingly :)

README.md

@@ -4,5 +4,5 @@ base_model:
 - openai/clip-vit-large-patch14
 - laion/CLIP-ViT-bigG-14-laion2B-39B-b160k
 - Laxhar/noobai-XL-1.0
-library_name: diffusers
+library_name: transformers
 ---