Update torchaudio resampling

[carolineechen]

Resolves #6

Summary of Changes

• used the latest version of torchaudio (0.9.0), which contains various resampling improvements
• replaced torchaudio resample_waveform with the new functional.resample, since compliance.kaldi.resample is being deprecated
• removed functional.resample from impulse graphs and replaced functional.resample spectrograms with transforms.Resample using a larger lowpass_filter_width parameter, similar the julius plots. functional.resample should numerically match transforms.Resample, so plotting both seems redundant
• updated README to reflect resampling times in notebook as run on my local machine

Let me know if you have any questions or suggestions!

[jonashaag]

Huh, I did a review very soon after you created this PR. Where has it gone?! Will have to do it again.