Update invocations (--listings deprecated)

Author: hseg

docs/index.md

@@ -688,7 +688,7 @@ A list of variables follows.
 -   `listings`: if True, generate code blocks for `listings` package.
     Only relevant for LaTeX output. `\usepackage{listings}` will be
     automatically added to `header-includes`. You need to specify
-    `--listings` option as well.
+    `--syntax-highlighting=idiomatic` option as well.
 -   `codeBlockCaptions`: if True, parse table-style code block captions.
 -   `autoSectionLabels`, default `false`: Automatically prefix all
     section labels with `sec:`. Note that this messes with pandoc's

mkinttest.sh

@@ -10,7 +10,7 @@ find test/m2m -iname 'input.md' -print | while read i; do
   listings=""
   standalone=""
   if [ "${bdn%%-*}" == "listings" ]; then
-    listings="--listings"
+    listings="--syntax-highlighting=idiomatic"
   fi
   if [ "${bdn%%-*}" == "standalone" ]; then
     standalone="--standalone"