Update API to be more modern

[IAmJSD]

No description provided.

[lovell]

Thank you for the PR, giving this package a bit of attention is very much overdue. I've seen more reference to Travis the Scottish band than I have Travis the CI tool over the last few years.

As we're discussing an API overhaul, do you have any thoughts about if allowing the Postcode constructor to accept/require a string would be a good idea rather than, or perhaps in addition to, providing from... factory method(s)?

[IAmJSD]

Thank you for the PR, giving this package a bit of attention is very much overdue. I've seen more reference to Travis the Scottish band than I have Travis the CI tool over the last few years.

As we're discussing an API overhaul, do you have any thoughts about if allowing the Postcode constructor to accept/require a string would be a good idea rather than, or perhaps in addition to, providing from... factory method(s)?

Yeah, I think this might be better actually! Maybe a few static methods (depending on wanted strictness), also yeah maybe we should remove travis totally from this and move to github actions. Will take a look tomorrow.

[lovell]

Great, thank you, commit 7a3a979 makes the switch to GitHub Actions. When you get a moment please can you rebase this PR against the new main branch to pick this change up. (I didn't alter any code or tests, other than fix the weird file modes, so hopefully this should "just work".)

[IAmJSD]

Hey @lovell, I've went and added more methods and tests that might be helpful and rebased 👍