Add :scope support

[xzfc]

Typical use-case is shown at MDN web docs: https://developer.mozilla.org/en-US/docs/Web/CSS/:scope#Direct_children

[beaumontjonathan]

Hi there! I see the project has recently picked up new maintainers and was wondering if there was any progress with this? Am using this for a project, and selecting children ElementRefs is a nightmare are the moment, and this could seriously help. Willing to fix up this PR if needs be?

[xzfc]

Yep. I just rebased the branch to resolve conflicts.

[TonalidadeHidrica]

I really want to use this feature, but it is not published on crates.io yet. Are there any plan when will the next version be published?

Also, how can I use the latest features meanwhile? I'm new to Rust so I'm unconfident at all, but maybe writing the following line

scraper = { git = "https://github.com/causal-agent/scraper", branch = "master" }

to Cargo.toml will do? Or are there some other best practice to do so?

[causal-agent]

published 0.12.0 https://crates.io/crates/scraper

[TonalidadeHidrica]

Thank you very much!!