[preset-env] v8 alpha 1

[romainmenke]

• [has-pseudo] release major version #456
• [blank-pseudo] release major version #457
• [prefers-color-scheme] release major version #455
• [focus-visible] [focus-within] analyse and verify #453
• [focus-visible] [focus-within] analyse and verify #453
• [preset-env] flip enableClientSidePolyfills #454
• migration docs

[romainmenke]

@Antonio-Laguna can we release something like v8.0.0-alpha.1 and v8.0.0-alpha.2 after each batch of changes?

I would like to make these changes available early but I wan't to avoid these showing up in npm outdated.

I have no idea how npm handles alpha versions.

[Antonio-Laguna]

I should be able to do it by running these commands:

npm version premajor --preid alpha and then npm publish --tag alpha so we create a separate publish stream. See https://docs.npmjs.com/cli/v8/commands/npm-dist-tag

I think this should keep outdated from happening but I've never done this. We'll have to see!

[Antonio-Laguna]

This can now be closed as this has been released!