Release asciidoctor-go v0.6.0 (2024-09-07)

=== Breaking changes

* all: rename struct "AttributeEntry" to "DocumentAttribute"

  This is to make the struct is clear that it represent the document
  attribute.

* all: rename struct "AttributeEntry" to "DocumentAttribute"

  This is to make the struct is clear that it represent the document
  attribute.

* all: refactoring DocumentAttribute into struct

  Using struct limit the value to only string, while some attributes can
  be an integer value, for example "leveloffset".

=== New features

* all: support document attribute "leveloffset"

  The ":leveloffset:" on document attribute allow increment or decrement
  the heading level on included files.

  Reference: https://docs.asciidoctor.org/asciidoc/latest/directives/include-with-leveloffset/

=== Enhancements

* all: use strict document header format

  Previously, an empty line before Document Title cause the parser stop
  parsing the document header, now an empty lines are skipped.
  Also document attribute can be place anywhere, either before or after
  title, and in between attributes; now it can be only placed after
  revision or author or title.

* all: remove unnecessary TrimRight

  Each lines to be parsed has been trimmed on the first load, so there
  is no need to do it again, on some cases
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