fix readme

README.md

@@ -50,7 +50,7 @@ waveforms = hifi_gan.decode_batch(mel_specs)
 
 ```python
 import torchaudio
-from speechbrain.pretrained import HIFIGAN
+from speechbrain.inference.vocoders import HIFIGAN
 from speechbrain.lobes.models.FastSpeech2 import mel_spectogram
 
 # Load a pretrained HIFIGAN Vocoder
@@ -99,7 +99,7 @@ torchaudio.save('waveform_reconstructed.wav', waveforms.squeeze(1), 22050)
 ### Using the Vocoder with the TTS
 ```python
 import torchaudio
-from speechbrain.inference.TTS Tacotron2
+from speechbrain.inference.TTS import Tacotron2
 from speechbrain.inference.vocoders import HIFIGAN
 
 # Intialize TTS (tacotron2) and Vocoder (HiFIGAN)