Update README.md

A comma is missing in diffusers pipeline which will cause error.

README.md

@@ -112,7 +112,7 @@ prompt = "CG animation style, a small blue bird takes off from the ground, flapp
 
 output = pipeline(
     image=first_frame,
-    guidance_scale=5.0
+    guidance_scale=5.0,
     prompt=prompt,
     num_inference_steps=50,
     height=544,  # 720 for 720P