Add support for expressions

[natemoo-re]

The README currently states:

Tiny, fault-tolerant and friendly HTML-like parser. Works with HTML, Astro, Vue, Svelte, and any other HTML-like syntax.

Unfortunately, there are cases where this is not true! Expression statements and expression attributes in Astro/Vue/Svelte.

This PR adds handling for expression attributes/statements.

• Handle expression attributes
• Fix unbalanced braces in strings ("{", '{')
• Fix unbalanced braces in RegExp (/{/g)
• Fix unbalanced braces in template literals (`{${"{"}}`)
• BREAKING? Expose attributes as an array?

[changeset-bot]

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Latest commit: b0a41f8

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