Use to mmark-0.1 and mmark-ext-0.3

Author: mrkkrp

CHANGELOG.md

@@ -1,3 +1,34 @@
+## Unreleased
+
+* The package now requires `mmark-0.1` and `mmark-ext-0.3` or later.
+
+* `--ext-footnotes` now checks the footnotes of a document: a reference that
+  leads nowhere, a footnote that nothing refers to, a footnote that is
+  defined twice, and more than one footnote section are all reported as
+  errors.
+
+* `--ext-toc` reports a document that asks for a table of contents but has
+  no headings to put in one. The table of contents is also inserted before
+  the other extensions run now, so `--ext-punctuation` applies to it too.
+
+* Added the following extensions, all new in `mmark-ext-0.3`:
+
+    * `--ext-emoji`, which replaces `:shortcode:` with the emoji it names
+      and reports a name it does not recognize.
+    * `--ext-lazy-images`, which gives every image `loading="lazy"` and
+      `decoding="async"`.
+    * `--ext-line-highlight`, which points at the lines of a code block
+      named by its info string, as in ```` ```haskell {2,4-6} ````. Both
+      syntax highlighters read the same specification, so this renders the
+      blocks they do not take.
+    * `--ext-mermaid`, which renders a `mermaid` code block as `<pre
+      class="mermaid">` for the mermaid script to pick up in the browser.
+    * `--ext-permalinks`, which appends to every heading a link to its own
+      id.
+
+* Removed `--ext-font-awesome` and `--ext-obfuscate-email`, because the
+  extensions behind them are gone from `mmark-ext-0.3`.
+
 ## MMark CLI 0.0.5.2
 
 * Maintenance release with more minimal dependencies.