Fixing typo in HifiGAN import statement

README.md

@@ -52,8 +52,8 @@ from nemo.collections.tts.models import FastPitchModel
 spec_generator = FastPitchModel.from_pretrained("tts_en_fastpitch")
 
 # Load vocoder
-from nemo.collections.tts.models import Vocoder
-model = Vocoder.from_pretrained(model_name="tts_hifigan")
+from nemo.collections.tts.models import HifiGanModel
+model = HifiGanModel.from_pretrained(model_name="tts_hifigan")
 ```
 
 ### Generate audio