Release asciidoctor-go v0.4.0 (2023-02-12)

===  New features

* all: add support for document attribute "last-update-label"
* all: implement inline macro for passthrough ("pass:")
* all: implement macro "footnote:"

===  Bug fixes

* all: detach parsing preamble from content.
  This is to prevent empty preamble being rendered in HTML content.

* all: fix the orders of generated HTML meta

===  Enhancements

* all: support multi line attribute values
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