Convert ChangeLog to Markdown and keepachangelog style

This matches the new Frescobaldi changelog.

Author: jeanas

CHANGELOG.md

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+<!-- Please follow this spec: https://keepachangelog.com/
+[X.Y.Z] links to the GitHub list of commits in a tag/release are
+defined at the bottom of this file.
+-->
+
+# ChangeLog
+
+All notable changes to the python-ly project are documented in this file.
+
+
+## [0.9.7] - 2020-12-25
+
+### Changed
+
+- Added LilyPond 2.20 words (#140)
+
+### Fixed
+
+- Fixed error when making rhythm implicit per line (#144)
+
+
+## [0.9.6] - 2020-01-22
+
+
+### Fixed
+
+- eps-file -> epsfile (#1213 on Frescobaldi repository)
+- MusicXML output:
+  - Correctly export measures without the help of explicit barchecks (#32)
+  - Export \mark (#102)
+  - Fix scale_rest bug (#107)
+  - Stem direction is now supported (#110)
+  - Fix empty measures created with no attributes (#114)
+
+### Changed
+
+- Various improvements to the experimental MusicXML output by Felippe Roza,
+    Peter Bjuhr, Urs Liska, Endre Oma and others, thanks!
+- Improved indentation of Scheme code, thanks to Paul Morris (#132)
+
+
+## [0.9.5] - 2017-02-17
+
+### Added
+
+- Basic support for tokenizing the MUP format
+
+### Fixed
+
+- Fixed wrong duration handling with \partial when
+  changing durations (#832 on Frescobaldi repository)
+- XML export tests now work correctly with Python 3
+- Fix traversing events failing in empty \alternative (#74)
+
+
+## [0.9.4] - 2016-04-20
+
+### Added
+
+- Add simplifier transposer and simplify-accidentals ly command (#40)
+- Recognize \bookOutputName A (without quotes, although not recommended)
+- Allow multi-digit fingering, e.g. c-34, LilyPond supports that since at least
+  2.16.
+- Add ly-server: an HTTP-server for manipulating LilyPond source, contributed by
+  Urs Liska
+
+
+### Changed
+
+- Support LilyPond 2.18+ behaviour on \relative without startpitch in
+  the ly.pitch.transpose, ly.pitch.rel2abs and ly.pitch.abs2rel modules.
+- Support LilyPond 2.18+ behaviour on \relative without startpitch in the
+  transpose, rel2abs, abs2rel and musicxml ly commands. Two new variables
+  were added to influence the behaviour: rel-absolute and rel-startpitch.
+- Various updates and improvements in MusicXML export contributed by Peter Bjuhr
+
+### Fixed
+
+- Make define-markup-command recognition working again
+- Do not add durations to bass notes in chordmode (#56)
+- Handle \include commands correctly when exporting to MusicXML (#59)
+
+
+## [0.9.3] - 2015-12-24
+
+### Added
+
+- Added ly.rhythm.music_items() for a more robust way of iterating through
+  chords and notes (awaiting fully fledged editing support through ly.music or
+  ly.xml)
+
+### Fixed
+
+- Do not insert duration after a tie (#35)
+
+### Changed
+
+- More configurability in ly.colorize, thanks to Urs Liska
+- MusicXML export various improvements and bug fixes, contributed by Peter Bjuhr
+
+
+## [0.9.2] - 2015-05-14
+
+### Added
+
+- Add the default-language variable to the ly command; this can be set to a
+  language in case a LilyPond document uses a language different than
+  "nederlands" but does not specify it (#20)
+- Add the `-l`, `--language` option as shorthand for setting the default language
+- properly support drum notes in ly.lex and ly.music
+
+### Changed
+
+- Updated scheme variables in ly.data.scheme* functions for LilyPond 2.18
+- MusicXML export improvements:
+  - support for isolated durations (a single duration without
+    explicit pitch)
+  - support for implicit starting pitch in relative mode
+    (issues #18 and wbsoft/frescobaldi#648)
+
+### Fixed
+
+- Fix TypeError: expected string or buffer in dom.ly when string was a
+  dom.Reference (#667 on Frescobaldi repository)
+- Fix issue #16: Duration after `\skip` may not be removed
+
+
+## [0.9.1] - 2015-03-08
+
+### Changed
+
+- Updated LilyPond data to 2.18
+
+## [0.9] - 2015-03-07
+
+### Added
+
+- Added ly.rests containing various rest manipulations
+- A script `xml-export.ily` has been included to dump the music structure
+  inside LilyPond to an XML file. This is not used yet, but could be used in the
+  future to use LilyPond to parse files and build music, and then export it
+  to other formats.
+
+### Changed
+
+- Robust Python 3 support, Python 3 is now recommended, although 2.7 will
+  still be supported for the foreseeable future.
+- MusicXML export improvements
+
+### Fixed
+
+- Don't yield the duration in a \tuplet command as a music token (issue
+  wbsoft/frescobaldi#631)
+
+
+## [0.8] -- 2015-01-24
+
+### Added
+
+- Basic api documentation included
+
+### Fixed
+
+- Fix (albeit experimental) musicxml export
+
+
+## [0.7] - 2015-01-23
+
+### Changed
+
+- First release as an officially separate project from Frescobaldi
+- Add INSTALL.md to source distribution
+
+## [0.6] - 2015-01-23
+
+### Changed
+
+- node and slexer are no longer toplevel modules; only the ly package
+
+## [0.5] - 2015-01-21
+
+### Changed
+
+- Large MusicXML export improvements, contributed by Peter Bjuhr (MusicXML
+  export is still experimental)
+
+### Fixed
+
+- Handle german pitch names asas and heses correctly when writing those
+- Don't transpose chord argument of \stringTuning command
+- Python 3 robustness improvements
+
+## [0.4] - 2014-03-05
+
+### Changed
+
+- Small MusicXML export improvements, contributed by Peter Bjuhr (MusicXML
+  export is still very experimental)
+
+### Fixed
+
+- Fix transposing when alterations would be more than a double sharp or double
+  flat; handle it by moving the note, just like LilyPond does it
+- Python 3 installation fixes
+
+## [0.3] - 2014-02-05
+
+
+### Added
+
+- New command 'highlight' ('hl') to create syntax-highlighted HTML files of
+  LilyPond source files (or any file that is understood by ly.lex)
+- New, very experimental, command 'musicxml' to export music to MusicXML
+
+## [0.2] - 2014-01-08
+
+### Added
+
+- New commands 'abs2rel' and 'rel2abs' that convert \relative music to
+  absolute and vice versa
+- Support for Python 3. Not all of the ly python module has already been
+  tested, but installing and running the various ly commands works well.
+
+## [0.1] - 2014-01-07
+
+Initial release.
+
+
+
+[0.8]: https://github.com/frescobaldi/frescobaldi/compare/v0.7..v0.8
+[0.9]: https://github.com/frescobaldi/frescobaldi/compare/v0.8..v0.9
+[0.9.1]: https://github.com/frescobaldi/frescobaldi/compare/v0.9..v0.9.1
+[0.9.2]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.1..v0.9.2
+[0.9.3]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.2..v0.9.3
+[0.9.4]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.3..v0.9.4
+[0.9.5]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.4..v0.9.5
+[0.9.6]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.5..v0.9.6
+[0.9.7]: https://github.com/frescobaldi/frescobaldi/compare/v0.9.6..v0.9.7