Assume the --greedy flag for brew outdated when HOMEBREW_UPGRADE_GREEDY is set

[andrewbraxton]

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If a user has set the HOMEBREW_UPGRADE_GREEDY env var, it implies that they are interested in always having their Casks upgraded "greedily" during brew upgrade.

It follows that such a user would additionally always be interested in knowing whether their Casks are "greedily" outdated when running brew outdated. Thus, this change makes brew outdated respect HOMEBREW_UPGRADE_GREEDY in the same manner as brew upgrade.

[MikeMcQuaid]

Great idea! Think the diff can be minimised.

[MikeMcQuaid]

Thanks so much for your first contribution! Without people like you submitting PRs we couldn't run this project. You rock, @andrewbraxton!