Update README.md

Author: wolfv

README.md

@@ -41,7 +41,7 @@ double duration = 1.0;
 auto t = xt::arange(0.0, duration, 1.0 / sampling_freq);
 auto y = xt::sin(2.0 * numeric_constants<double>::PI * freq * t);
 
-xt::dump_audio("files/sine.wav", y, SF_FORMAT_WAV | SF_FORMAT_PCM_16, sampling_freq);
+xt::dump_audio("files/sine.wav", y, sampling_freq);
 ```
 
 ### Installation