remove deprecated env method, bump version to 1.3.0

[dorianmariecom]

it's been deprecated for a while

[stefannibrasil]

Thanks @dorianmariecom 🎉 Could you fix the conflict? This should be good to go once the conflict is resolved.

[dorianmariecom]

@stefannibrasil done

[stefannibrasil]

Thank you! Will cut a release this week, hopefully.

[nickcharlton]

I missed actually submitting this before it was merged, for some reason. But we should avoid doing this in future.

[nickcharlton]

We shouldn't change versions outside the release commit — this makes it easier to see when the release was cut, especially as it'll include CHANGELOG entries too.

I'd also generally wait until releasing a major version. We don't know who's relying on a deprecated method, and seeing a major version coming in and then you're tests failing all of a sudden is a better hint.

[stefannibrasil]

Ah, I am sorry, Nick! I saw that this method had been deprecated for a while and didn't see any issues. I was planning on cutting a release announcing the deprecation. I will rollback the commit and reopen this PR.