updated example in README.

README.md

@@ -70,7 +70,7 @@ The reference runtime is `StreamingLilyletGenerator` in the
 from lilyscript.generator import StreamingLilyletGenerator
 
 gen = StreamingLilyletGenerator(model_dir='onnx', asset_dir='onnx')
-prompt = '[composer "Beethoven, Ludwig van"]\n[genre "Classical"]\n[instrument "Keyboard"]'
+prompt = '%Beethoven, Ludwig van\n%Classical\n%Keyboard'
 for raw, pretty, done in gen.generate_stream(prompt_text=prompt, measures=8, temperature=1.0, seed=42):
     pass        # `pretty` is measure-segmented Lilylet; streams one patch at a time
 print(pretty)
@@ -79,8 +79,8 @@ print(pretty)
 Output is Lilylet text, e.g.:
 
 ```
-[composer "Beethoven, Ludwig van"]
-[genre "Classical"]
+%Beethoven, Ludwig van
+%Classical
 \key g \major \time 3/4 \clef "treble" \tempo 4=54 ^\markup "Andante con moto" r2. \\
 ...
 ```