Say which Julia binary is updated when updating

[eschnett]

When I type juliaup update, and when it's time to update, then juliaup only says

  Downloading: [=============>      ] 138.80 MiB/204.70 MiB eta: 12s

It doesn't say which Julia binary is being updated – that would be nice to know. For example, a line updating alpha, or Downloading nightly: [====> would be convenient.

[davidanthoff]

I just reverted #887, I think that was too chatty with lots of output about things that juliaup up didn't do.

I'm also a bit confused about the original issue here, doesn't the line above the "Downloading:" actually say which version is being installed?

[ghyatzo]

From the install_version function there is the code:

    eprintln!(
        "{} Julia {}",
        style("Installing").green().bold(),
        fullversion
    );

that prints fullversion, it could be easily extended to add some channel information:

    eprintln!(
        "{} Julia {} on channel {}",
        style("Installing").green().bold(),
        fullversion,
        channel
    );