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* Support Python 3.6, 3.7, 3.8 and 3.9
* Drop support for Python 2.4 through 2.7, and Python 3.0 through 3.5 (169)
* Convert feedparser from a monolithic file to a package
* ``feedparser.parse(sanitize_html=bool)`` argument replaces the ``feedparser.SANITIZE_HTML`` global
* ``feedparser.parse(resolve_relative_uris=bool)`` replaces the ``feedparser.RESOLVE_RELATIVE_URIS`` global
* Unify the codebase so that 2to3 conversion is no longer required
* Remove references to iconv_codecs
* Update the Creative Commons namespace URI's
* Update the default User-Agent name and URL
* Support Middle European (Summer) Time timezones (20)
* Pass ``data`` to ``lazy_chardet_encoding()`` (50)
* Document that datetimes are returned in UTC (51)
* Remove cjkpython references in the documentation (57)
* Resolve ResourceWarnings thrown during unit tests (170)
* Fix tox build failures (213)
* Use ``base64.decodebytes()`` directly to support Python 3.9 (201)
* Fix Python 3.8 ``urllib.parse.splittype()`` deprecation warning (211)
* Support parsing colons in RFC822 timezones (144)
* Add `chardet` as an optional tox environment dependency
* Fix the Big5 unit test that fails when chardet is installed (184)