pyradio: Disable update check

pyradio checks for new releases every 10 days and offers the user to
self-update:

```console
$ pyradio --update
Released version   :  0.9.3.3
Installed version  :  0.9.3.1
Updating PyRadio...
Using directory: "/tmp/tmp-pyradio"
Downloading PyRadio source code...
  url: "https://github.com/coderholic/pyradio/archive/0.9.3.3.zip"
  filename: "/tmp/tmp-pyradio/pyradio-0.9.3.3.zip"
^CError: Failed to download PyRadio source code..
```

This functionality can be disabled by setting the `distro` configuration
parameter to anything different than `None`. With such patch applied, it
will now refuse to self-update:

```console
$ pyradio --update
PyRadio has been installed using either pip or your distribution's
package manager. Please use that to update it.
```

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

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