Fix README.md "Example Code"

["sample"] was replaced with ["images"] at some point.

README.md

@@ -57,7 +57,7 @@ pipe = StableDiffusionPipeline.from_pretrained(
 
 prompt = "1girl, aqua eyes, baseball cap, blonde hair, closed mouth, earrings, green background, hat, hoop earrings, jewelry, looking at viewer, shirt, short hair, simple background, solo, upper body, yellow shirt"
 with autocast("cuda"):
-    image = pipe(prompt, guidance_scale=6)["sample"][0]  
+    image = pipe(prompt, guidance_scale=6)["images"][0]  
     
 image.save("test.png")
 ```