Fix dynamic range of sweep plots, impulse comparision

[dofuuz]

Fixes #1

Ran on Google Colab: https://colab.research.google.com/drive/1ULnW9PoclISVNxVqDxycf7OHMs_azghi?usp=sharing

Jupyter Notebook Viewer: https://nbviewer.jupyter.org/github/dofuuz/audio-resampling-in-python/blob/range/Audio%20Resampling%20in%20Python.ipynb

Original version has different dynamic ranges for each sweep plots. So, same color dose not means same dB.

This PR makes all plots have same dynamic range for fair comparison. (-150dB ~) And uses friendly 'inferno' colormap.

[dofuuz]

I didn't changed any text section of notebook.

Here is my opinion:

• lilfilter should go to 'very good' tier. It's very fast and accurate.
• resampy goes to 'good' tier. It's is still good for most of case, but not best solution.

I think it's better to remove opinion-based text section on ipynb notebook if you are not going to update it.

[dofuuz]

Fixed issue #1

[adefossez]

Thanks @dofuuz for the fix :)