Notes about 1.0.0-beta.30

[JessicaSachs]

• Adding notes about async vs. sync mode.
• Adding placeholder for mocking transitions section.

[hiendv]

I think we could also document wrapper.vm.$nextTick() as an interchangeable option to Vue.nextTick().

[lmiller1990]

@JessicaSachs a bit about mocking transitions, 99% of the work was done by @hiendv , I hope you don't mind I used your example and sneaky transitionStub helper.

I'm excited to learn how Vue's <transition> works under the hood (have not used it much), and how we can let it work correctly in VTU as well.

[hiendv]

@lmiller1990 It would be my honor. I've been using VTU for years but never had a chance (or time 🤣 ) to contribute back to the library. Glad you took my snippet which, to be honest, is kinda a skimmed version of the original by @eddyerburgh. I think the old component stubs could be a good start for you.

[FloEdelmann]

Coming from #1367, I've got some remarks.

[JessicaSachs]

These docs will help provide guidance for 1.0.0-beta.30 migration-related issues

[vue-bot]

Hey @JessicaSachs, thank you for your time and effort spent on this PR, contributions like yours help make Vue better for everyone. Cheers! 💚