add some class to the hr divider for downloads.html

downloads.html

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 				<p><b>Source code (4.1.1)</b></p>
 
 				<p class="indent">➛ <a href="dist/libotr/4.1.1/libotr-4.1.1.tar.gz">Compressed tarball</a> (<a href="dist/libotr/4.1.1/libotr-4.1.1.tar.gz">sig</a>)</p>
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 				<h2>Pidgin-otr</h2>
 				<p>This is a plugin for Pidgin 2.x which implements Off-the-Record Messaging over any IM network Pidgin supports.</p>