Update README.md (#93)

Signed-off-by: Mattt Zmuda <mattt@replicate.com>

Author: cbh123

README.md

@@ -165,7 +165,7 @@ from urllib.request import urlretrieve
 
 model = replicate.models.get("stability-ai/stable-diffusion")
 version = model.versions.get("27b93a2413e7f36cd83da926f3656280b2931564ff050bf9575f1fdf9bcd7478")
-out = version.predict(prompt="wavy colorful abstract patterns, cgsociety"
+out = version.predict(prompt="wavy colorful abstract patterns, cgsociety")
 urlretrieve(out[0], "/tmp/out.png")
 background = Image.open("/tmp/out.png")
 ```