v0.0.6 - Button styling

Add the ability to style the buttons with CSS.

v0.0.5

Add the possibility to use the react-audio-recorder visualizer instead of buttons.

Add pausing capability

Add pausing capability by adding a pause button if the pause_prompt argument is specified.

Use Pydub

This is a breaking change release.

The package has been updated to work with the newer version of streamlit, and:

• It now returns a pydub AudioSegment, which requires the installation of ffmpeg and pydub.
  If I get feedback that it was useful to just record audio without the need for ffmpeg, I can consider adding a flag to return only the byte code.
• It follows streamlit theme, as explained here.
  In particular, we use the theme variables: textColor, backgroundColor, secondaryBackgroundColor.

Note:
The audio is recorded by default in webm format in Firefox and Chrome, but Safari does not handle it and (likely) returns mp4.
I chose not to specify the format both in the frontend and the backend, given that ffmpeg handles it properly in all my tests, and it makes things simpler.