render rst file with a html5 reader

The default reader of Pelican for rst file inherits the html4css1 Class from docutils, this plugin replaces it with the more modern html5_polyglot Class from docutils. And it will always wrap a <code></code> tag around the literal-block within the <pre></pre> tag.

add

PLUGIN_PATHS = ['path/to/your/plugins']
PLUGINS = ['rst_with_html5']

to pelicanconf.py to use it.