Bump github.com/mattn/go-colorable from 0.1.4 to 0.1.8 in /server

[dependabot-preview[bot]]

Bumps github.com/mattn/go-colorable from 0.1.4 to 0.1.8.

Commits

• 2e1b0c1 Avoid index out of range
• f6c0098 Merge pull request #49 from segrey/sync-access-to-console
• b6d341e synchronize access to Console (fixes #48)
• f1b5a0e Merge pull request #51 from zetamatta/fork2
• ce7c9ec Fix: on Windows 8.1, ESC[7m (REVERSE) did not work.
• c10454b Merge pull request #50 from zetamatta/fork
• 4b79b6e Support disable-bold,real-underline and native reverse.
• 4e32bdb Merge pull request #46 from mattn/enablecolor
• 68e95eb Add EnableColorsStdout
• d58279a Merge branch 'master' of https://github.com/mattn/go-colorable
• Additional commits viewable in compare view

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