[gtk-doc] mkhtml2: add tag converter for 'classname'

[Stefan Sauer <stefkost src gnome org>]

commit e6859cf5abb943e0e7bff85f7073fb6e80bd6de4
Author: Stefan Sauer <ensonic users sf net>
Date:   Tue May 8 20:04:04 2018 +0200

    mkhtml2: add tag converter for 'classname'

 gtkdoc/mkhtml2.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtkdoc/mkhtml2.py b/gtkdoc/mkhtml2.py
index ac10e7a..b1798d6 100644
--- a/gtkdoc/mkhtml2.py
+++ b/gtkdoc/mkhtml2.py
@@ -1022,6 +1022,7 @@ convert_tags = {
     'application': convert_span,
     'bookinfo': convert_bookinfo,
     'blockquote': convert_blockquote,
+    'classname': convert_code,
     'caption': convert_div,
     'code': convert_code,
     'colspec': convert_colspec,