remove redundant dependencies

[hermannm]

Background

While implementing #21, I noticed that the library appeared to have some redundant dependencies. As I like to avoid transitive dependencies where possible, I thought I'd propose these changes.

Changes

• change IsColorTerminal to no longer depend on golang.org/x/term, since we already depend on go-isatty and can just use that
  • while doing this, I thought we might as well upgrade go-isatty to the newest version, which also lets us use a tagged version for golang.org/x/sys
• add asciiValid and asciiValidPrint functions, to avoid the dependency on segmentio/encoding (outside of tests, but that doesn't affect transitive dependencies)
  • since the rest of the codebase is ported without depending on segmentio, I thought it was a shame that just these two functions brought that whole dependency
  • also ported the tests for these functions

Sorry if I should have raised an issue about this first, but hope you might appreciate it anyway!

[neilotoole]

LGTM.

[neilotoole]

@hermannm Thank you, this is a great improvement! It's greatly appreciated.

I've got a bit of work to do on the GH workflow, it hasn't been touched in a while and has deprecation warnings for old versions of actions, and then I'll tag and release.

Thank you for all the work. Do you have any interest in being added as a collaborator on the repo?

[hermannm]

Thank you for all the work. Do you have any interest in being added as a collaborator on the repo?

@neilotoole Sure, I'd be delighted to!

[neilotoole]

@hermannm Excellent. Invitation sent. Welcome!

Also: v0.7.0 has been tagged. Please feel free to verify if you have time.

[hermannm]

@neilotoole Great to hear! I'll check it out