Support sweetalert2 v8

[zenflow]

Closes #66

No changes to the source code were actually needed to get the tests passing; just needed to stop some removed features in the cleanSwalState test utility function.

Note that this PR keeps support for v7, but in the next major release I think we should drop it.

We should merge this with commit message feat(package): support sweetalert2 v8. The changes are backwards-compatible so we can make it a minor release.

Just one more commit to add: since the new Swal.update static method is not supported yet, I think calling it should throw an error. @limonte any thoughts?

[zenflow]

Just one more commit to add: since the new Swal.update static method is not supported yet, I think calling it should throw an error. @limonte any thoughts?

Since supporting Swal.update will mean a huge amount of churn (almost a rewrite of the package, see the integrate-update-method branch) I would like to release this feature in the next major version, even though the changes should be backwards-compatible

edit: see issue #73

[limonte]

Yay! 🎉

Just one more commit to add: since the new Swal.update static method is not supported yet, I think calling it should throw an error. @limonte any thoughts?

I don't have any strong opinion here, please go ahead with whatever you think is the better way.

[limonte]

With jest v24 and sweetalert2@^8.3.0 the CI build is passing 🚀

@zenflow please remove WIP and merge the PR if you think it's good to go

[zenflow]

I would like to resolve issue #82/#83 (same issue) before attempting/making this release, but unfortunately work has been demanding more of my time lately, and this will continue for at least another few weeks.

@gverni if you have time and are keen on it (which you generally seem to be for Swal2 😃), would you like to resolve issue #82/#83 and see this PR across the finish line?

Aside from that issue, I think this PR is ready to be merged and released

[limonte]

#82 and #83 are false alarms as I understand correctly, should be fixed by f891fbd

[zenflow]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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