Update markdown-extra.php from verion 1.2.6 to 1.2.8

Hi guys,

currently Markdown on Save uses markdown-extra 1.2.6 (1)

Is it possible to update to PHP Markdown Extra 1.2.8 (http://michelf.ca/projects/php-markdown/classic/ )?

In the current version only the class functionality for headings is supported:
## Heading {.myclass}

But I would need that feature also for images and a-tags.

Thank you very much in advance.
Mathias

define( ‘MARKDOWNEXTRA_VERSION’, “1.2.6” ); # Sun 13 Jan 2013
http://plugins.svn.wordpress.org/markdown-on-save/tags/1.2.1/markdown-extra/markdown-extra.php

https://wordpress.org/plugins/markdown-on-save/