Add changelog

CHANGELOG.rst

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+Changelog
+=========
+
+0.0.4
+-----
+
+* [Feature] Added ability to set your own branding in the top of the sidebar
+
+
+0.0.3
+-----
+
+* [Feature] Added Python 3 support
+
+
+0.0.1
+-----
+
+* Initial release
+
+
+
+