Release asciidoctor-go v0.3.0 (2022-07-24)

This release set the minimum Go version to 1.18.

===  Breaking changes

*  all: refactoring handling generate ref ID

===  Enhancements

*  all: sort the generated HTML meta by names

*  all: store the list of author names under Attributes "author_names"

*  all: add default metadata "generator"

*  all: realign all structs

===  Chores

*  all: rewrite test using lib/test.Data
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