Add `selectOne`

[ibarrae]

Closes #257

Before submitting your PR, check that you've:

• [x] Bumped the version number.
• [x] Documented new APIs with Haddock markup.
• [x] Added @since declarations to the Haddock.
• [x] Ran stylish-haskell and otherwise adhered to the style guide.

After submitting your PR:

• [x] Update the Changelog.md file with a link to your PR.
• [x] Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts).

[belevy]

I'd prefer that the function be called selectFirst, unfortunately that would technically be a major API break since we're re-exporting persistent. Perhaps we could put this in the release that removes the old syntax?

[ibarrae]

I'd prefer that the function be called selectFirst, unfortunately that would technically be a major API break since we're re-exporting persistent. Perhaps we could put this in the release that removes the old syntax?

Thanks for the quick reply @belevy :) I was wondering about that, to avoid conflicts with existent persistent function, thus I thought as a workaround (for now) to get it called in a different way.

And correct me if I'm wrong, but you are mentioning to put this as part of ~4.0.0.0~ 3.6 right?

[belevy]

@parsonsmatt Correct me if I'm wrong but this would require a bump in the major version right i.e 4.0.0

[parsonsmatt]

esqueleto uses PVP versioning so we could put this out with selectFirst as an esqueleto function with 3.6.0.0

[ibarrae]

Thanks for all the suggestions @belevy @parsonsmatt, I updated the branch accordingly and also updated the version number. Any more feedback is more than welcome :tada:

[parsonsmatt]

released! thanks 😄