Update README.md

Fix an error in the readme example

README.md

@@ -40,7 +40,7 @@ import torch
 unet = UNet2DConditionModel.from_pretrained("latent-consistency/lcm-sdxl", torch_dtype=torch.float16, variant="fp16")
 pipe = DiffusionPipeline.from_pretrained("stabilityai/stable-diffusion-xl-base-1.0", unet=unet, torch_dtype=torch.float16, variant="fp16")
 
-pipe.scheduler = LCMScheduler.from_config(sd_pipe.scheduler.config)
+pipe.scheduler = LCMScheduler.from_config(pipe.scheduler.config)
 pipe.to("cuda")
 
 prompt = "a close-up picture of an old man standing in the rain"