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In this release OpenGraph parsing is improved:
* known OpenGraph namespaces (og, music, video,
article, book, profile) work without an explicitly defined prefix;
* prefix is extracted both from ``<head>`` and ``<html>`` element attributes,
not only from ``<head>``;
* prefix parsing is more permissive.
Other changes:
* pypi version badge is added to the README;
* html parsing code is cleaned up.