Add install dependencies for Ubuntu 20.04 to README.md

[subterfugium]

Here's list of dependencies to Ubuntu 20.04 (installing whipper without snap and avoiding python2 related packages).

Dependencies:

sudo apt install cd-paranoia cdrdao gobject-introspection libsndfile1 libsndfile1-dev libdiscid-dev libdiscid0 flac sox git python3-musicbrainzngs python3-cdio
sudo -H pip3 install discid

(Ubuntu 20.04 seem to be missing python3-discid package so I installed it via pip3)

Optionally install if using plugins:

sudo apt install python3-ruamel.yaml

Then install

git clone https://github.com/whipper-team/whipper.git
cd whipper
sudo -H python3 setup.py install

That should be all. Test using:
whipper

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[walterav1984]

On ubuntu-mate 20.04 also the following dependencies has to get satisfied otherwise whipper will not start:

sudo apt install python3-mutagen python3-ruamel.yaml

However @subterfugium were you also affected by "cd-paranoia" vs "cdparanoia"? I needed to remove "cd-paranoia" and install "cdparanoia" and symlink as suggested by @mandree see #234 (comment) otherwise ZeroDivisionError will block the rip.