Deprecate Go < 1.14

[jharshman]

In accordance with our adopted best practices, the main branch and the
next major release of Cobra will deprecate older and un-maintained
versions of Golang.

fix #1322

[jharshman]

@umarcor I would actually like to incorporate some of the changes from #1044. Namely the addition of golangci-lint and the fixes to the issues the linters surface.

Let me know how you would like to proceed with that PR.

[jpmcb]

Does this also need changes in go.mod? I see

 go 1.12

Will this need to be updated to 1.14?

[jharshman]

@jpmcb good catch, yes that should be updated as well.

[umarcor]

@jharshman, please, go ahead with this. I will then rebase and cleanup on top of master. Adding golangci-lint and so is not strictly related to this, but it will make it easier if I can focus on >1.11 features only. FTR, I did split the initial golangci-lint into two PRs for keeping >1.11 features isolated. Now, both can be merged again, so I will close one of them.

[jpmcb]

Sweet - Thanks @jharshman looks good to me! 👍

[jharshman]

Merging w/o latest CI run. TravisCI still queuing and takes forever. Seems to be related to their switch from .org to .com.

[umarcor]

@jharshman, unfortunately, I don't think it's a transitory issue. The switch from .org to .com has been going on for 2-3 years. However, they recently changed their pricing model. Free resources for open source projects were significantly reduced, and maintainers need to periodically request additional "credits". Since this projects is in spf13's namespace, I guess that only he can see the state of the credits.

In practice, most open source projects are migrating from Travis CI to somewhere else, mostly GitHub Actions.

• https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing
• The new pricing model for Travis CI python-pillow/Pillow#5028
• https://www.jeffgeerling.com/blog/2020/travis-cis-new-pricing-plan-threw-wrench-my-open-source-works