Use new "optional" syntax from autorefs

Author: oprypin

mkdocstrings/handlers/crystal/renderer.py

@@ -85,7 +85,7 @@ def do_reference(self, path: Union[str, DocPath], text: Optional[str] = None) ->
         except base.CollectionError:
             return text
         else:
-            html = '<span data-mkdocstrings-identifier="{}">{}</span>'
+            html = '<span data-autorefs-optional="{}">{}</span>'
             return Markup(html).format(ref_obj.abs_id, text)
 
     def do_convert_markdown(self, text: str, context: DocItem, heading_level: int, html_id: str):
@@ -139,4 +139,4 @@ def run(self, root: etree.Element):
             el.tail = None
             # Put the `code` into the `span`, with a special attribute for mkdocstrings to pick up.
             span.append(el)
-            span.set("data-mkdocstrings-identifier", ref_obj.abs_id)
+            span.set("data-autorefs-optional", ref_obj.abs_id)

pyproject.toml

@@ -18,6 +18,7 @@ deduplicate-toc = "mkdocstrings.handlers.crystal.deduplicate_toc:DeduplicateTocE
 python = "^3.7"
 mkdocstrings = "^0.15.0"
 markdown-callouts = "^0.1.0"
+mkdocs-autorefs = "^0.2.0"
 markupsafe = "^1.1.1"
 cached-property = "^1.5.2"
 Jinja2 = "^2.11.2"