docs: add deflists to supported features

Author: KyleKing

README.md

@@ -19,6 +19,7 @@ Supports:
     - \*Note: `mdformat-admon` will format the same admonitions, but for consistency with the mkdocs styleguide, an extra space will be added by this package ([#22](https://github.com/KyleKing/mdformat-admon/pull/22))
 - [MkDocs-Material Content Tabs\*](https://squidfunk.github.io/mkdocs-material/reference/content-tabs)
     - \*Note: the markup (HTML) rendered by this plugin is sufficient for formatting but not for viewing in a browser. Please open an issue if you have a need to generate valid HTML.
+- [MkDocs-Material Definition Lists](https://squidfunk.github.io/mkdocs-material/reference/lists/#using-definition-lists)
 - [mkdocstrings Anchors (autorefs)](https://mkdocstrings.github.io/autorefs/#markdown-anchors)
 - [mkdocstrings Cross-References](https://mkdocstrings.github.io/usage/#cross-references)
 - [Python Markdown "Abbreviations"\*](https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-abbreviations)