Check for obsoleted(very old) Go versions on CI files

[cristaloleg]

Check .travis.yml, .circleci(any other CI/CD service) files for the old versions (1.9 and older) and suggest to update them.

[quasilyte]

I like the idea of checking .travis.yml and .circleci. We can also run their associated linters (if they exist) to catch more errors.

[quasilyte]

For .travis.yml travis-lint is now executed. I don't know anything that can validate .circleci.

But we can do proposed Go version checks though. :)

[cristaloleg]

Can we just parse yaml and check Go version manually?

[quasilyte]

Of course, I told about another thing, linting config files for non-existing properties, for example. Checking Go version is go-specific, this is why it's less attractive right now.

[cristaloleg]

But it can be extended till whatever you want 😎 (Go was just an example, biased one)