Trying to fix #121. I still need to write the tests but so you can already have a look and give your comments.

The logic goes like this:

• If no version is matching => we print out a message (like we used to)
• If only one version is matching (because the user provided a specific version 6.17.1 or because the prefix match only one installed version) => the version get uninstalled
• If multiple installed versions are matched: we print out the matching installed versions and ask the user to re-run the command with the correct version to uninstall.

Note: it's not possible to uninstall using latest or latest-v9.x, ... But that's already the case so nothing has changed here.