Run CI tests on range of Go versions

[jtraglia]

• Add matrix of Go versions we should support.
• Rename go.yml to test.yml (more descriptive).
• Add push.branches to lint.yml (not actually sure if this is needed).
• Remove quotes around "master" and remove brackets.

[jtraglia]

One minute. Something's not quite right.

[jtraglia]

Okay cool, should be good now 👍