Indent output of download command

[saesh]

Hey! This is a suggestion to align the output of the download command with the same format as other commands in the cli. Usually the command outputs are indented by 4 spaces and lines are separated by one empty line, see the submit command for example:

exercism submit expenses.go


    Your solution has been submitted successfully.
    View it at:


    https://exercism.org/tracks/go/exercises/expenses

download previous to the change:

$ exercism download --exercise=expenses --track=go

Downloaded to
/home/user/snap/exercism/5/exercism/go/expenses

$

download after the change:

$ exercism download --exercise=animal-magic --track=go

    Exercise has been successfully downloaded to:

    /home/user/exercism/5/exercism/go/animal-magic

$