Running Atlantis `testdrive` using a terminal with the Solaris light theme shows no apparent output

[jorianvo]

When I tried running the ./atlantis testdrive (v0.7.0) in my terminal I got the following confusing output:

It took me a few retries to figure out what was happening, after selecting the text my with cursor the output became visible:

[lkysow]

I bet this is because we're using a library to colour our strings: https://github.com/runatlantis/atlantis/blob/master/testdrive/testdrive.go#L40

If you removed the [white] it would probably work. PRs welcome.