Release ciigo v0.15.2 (2025-04-18)

This release update the core asciidoctor-go module that brings several
new features.

[NEW FEATURE] **Support include directive inside block code.**

Example of block code with include directive,

----
...
include::file[]
...
----

[NEW FEATURE] **Support document attribute "docdir".**

The "docdir" attribute contains the full path of the directory that
contains the source document.
By default it is set to the directory where the Document resided.

[NEW FEATURE] **Add default HTML stylesheet**.

The generated HTML now contains the default stylesheet.
The stylesheet is copied from HTML file generated by Asciidoctor
v2.0.23.
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