Update man page and changelog.

changelog

@@ -11,6 +11,9 @@ pandoc (2.0.6)
       bibliographic information can be processed with pandoc and
       pandoc-citeproc to produce a formatted bibliography.
 
+  * Allow `--list-extensions` to take an optional FORMAT argument.
+    This lists the extensions set by default for the selected FORMAT.
+
   * Markdown reader:
 
     + Preserve original whitespace between blocks.
@@ -546,6 +549,7 @@ pandoc (2.0.3)
     + Allow spaces after `\(` and before `\)` with `tex_math_single_backslash`.
       Previously `\( \frac{1}{a} < \frac{1}{b} \)` was not parsed as math in
       `markdown` or `html` `+tex_math_single_backslash`.
+    + Parse div with class `line-block` as LineBlock.
 
   * MANUAL: clarify that math extensions work with HTML.
     Clarify that `tex_math_dollars` and `tex_math_single_backslash`

man/pandoc.1

@@ -385,10 +385,10 @@ List supported output formats, one per line.
 .RS
 .RE
 .TP
-.B \f[C]\-\-list\-extensions\f[]
+.B \f[C]\-\-list\-extensions\f[][\f[C]=\f[]\f[I]FORMAT\f[]]
 List supported Markdown extensions, one per line, followed by a
 \f[C]+\f[] or \f[C]\-\f[] indicating whether it is enabled by default in
-pandoc\[aq]s Markdown.
+\f[I]FORMAT\f[] (defaulting to pandoc\[aq]s Markdown).
 .RS
 .RE
 .TP