Update README.md

Fix typo in usage example

README.md

@@ -68,7 +68,7 @@ image.save("cd_bedroom256_lpips_onestep_sample.png")
 # Multistep sampling
 # Timesteps can be explicitly specified; the particular timesteps below are from the original Github repo:
 # https://github.com/openai/consistency_models/blob/main/scripts/launch.sh#L83
-image = pipe(num_inference_steps=None, timesteps=[18, 0]).images[0]
+image = pipe(num_inference_steps=None, timesteps=[17, 0]).images[0]
 image.save("cd_bedroom256_lpips_multistep_sample.png")
 ```