Use https for twitter link

Signed-off-by: Michal Čihař <michal@cihar.com>

Author: nijel

pmaweb/templates/news/post_archive.html

@@ -12,7 +12,7 @@
 
 <p>You can also follow us on <a
 href="https://www.facebook.com/pages/PhpMyAdmin/157021164334486">Facebook</a> or <a
-href="http://twitter.com/phpmya">Twitter</a>. The news are also available in a
+href="https://twitter.com/phpmya">Twitter</a>. The news are also available in a
 <a href="{% url 'feed-news' %}">RSS feed</a>.
 </p>