Highlight outdated packages (`--outdated`)

[clue]

@wol-soft has implemented an up-to-date check based on #45 in wol-soft#1 which colorizes the graph.

Colorized graphs work like:

• green: latest version
• lemon-green: patch available
• yellow: minor patch available
• orange: new major version available
• red: package is abandoned

Originally posted by @wol-soft in #45 (comment)