Changes

Fixed string format syntax error in __str__ method of the GainData class which could be thrown in case rgain3 was used as a library.
Dropped support for Python 3.5 which reached end-of-life
Added support for MP4/iTunes album/artist tags
Updated the package structure so that the scripts are located in the rgain module. This means that they can now also be invoked using python -m rgain3.replaygain and python -m rgain3.collectiongain.
Added file type guessing based on magic numbers signature

rgain3 1.1.0 (2020-11-12)

Added support for Python 3.8 and 3.9
Added this file to the source distribution
Added files necessary for the tests to the source distribution
Fixed some deprecation warnings

rgain3 1.0.0 (2020-01-06)

Added support for Python 3.5, 3.6 and 3.7
Dropped support for Python 2.7
Fixed issue with MP3 files that did not contain ID3 headers

rgain 1.3.4 (2016-05-06)

Support an additional format of MusicBrainz tags for MP3 files.
Album artist tags for MP3 files are now case-sensitive.
Fix a potential bug where custom reference levels would still store the default reference level (89 dB).
Update readme and PyPI description re: inactivity.

rgain 1.3.3 (2014-10-09)

Fixed swapped album gain and track peak tags.

rgain 1.3.2 (2014-05-24)

Fixed some problems with non-UTF8 file names. They should now work as long as any file names touched by rgain match the system encoding. (https://bitbucket.org/fk/rgain/issue/12/unicodedecodeerror-ascii-codec-cant-decode)
Misc. bug fixes.

rgain 1.3.1 (2013-11-29)

Support MP4/AAC (courtesy of Yevgeny Bezman).

rgain 1.3 (2013-10-28)

Work around a bug in some pygobject 3.10 releases (https://bugzilla.gnome.org/show_bug.cgi?id=710447)
Properly recognise file extensions even with different capitalisation.
Overhaul album ID algorithm to be hopefully better at grouping files that belong to an album and, conversely, not mis-grouping files. Note that this change will invalidate any cache files you might still have so your entire collection will be re-scanned next time you run collectiongain.
Assorted bug fixes.

rgain 1.2.1 (2013-10-18)

Fix issue with reading MP3 reference loudness tags.

rgain 1.2 (2013-05-04)

Port to GStreamer 1.0.
Support default GStreamer command-line options for replaygain and collectiongain. All known GStreamer options can be listed by using the --help-gst flag.