0.22.0

CHANGES:

• (re_export melange.dom) by @swrup (#17)
• fix: Webapi__Dom__Document.asHtmlDocument by @davesnx (#20)
• port @mel.send.pipe to @mel.send + @mel.this by @anmonteiro (#23)
• build on Melange 6 / OCaml 5.4 by @anmonteiro (#27)