v2.7.0

The library is now available on JSR as @eemeli/yaml and on deno.land/x as yaml. In addition to Node.js and browsers, it should work in Deno, Bun, and Cloudflare Workers.

• Use .ts extension in all relative imports (#591)
• Ignore newline after block seq indicator as space before value (#590)
• Require Node.js 14.18 or later (was 14.6) (#598)