Add CHANGELOG to project

CHANGELOG.md

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+CHANGELOG
+=========
+
+1.9.2 - 2021-08-18
+------------------
+
+Use description field as subtitle for Atom feeds, if provided
+
+1.9.1 - 2020-02-09
+------------------
+
+Trim files included in source tarball
+
+1.9.0 - 2016-09-12
+------------------
+
+* Always set the `updated` element of an `entry` in Atom feeds
+* Change `get_tag_uri()` so the `/` before a fragment gets only added if there is a fragment
+
+1.8.0 - 2016-04-05
+------------------
+
+* Support Atom’s `<content>` element
+* Put Atom pubdate in `<published>`, not `<updated>`
+* Support giving an explicit `<updated>` for Atom
+
+1.7.0 - 2013-08-31
+------------------
+
+Set minimum pytz version
+
+1.6.0 - 2013-06-02
+------------------
+
+Add Python 3 support
+
+1.5.0 - 2013-01-11
+------------------
+
+Added tests
+
+1.2.1 - 2010-08-19
+------------------
+
+Initial packaged release