Changelog.md from MTG/SymbTr-extras

Changelog.md

Summary

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Issues

#### SymbTr-extras v0.4.0
 - Added a wrapper for mu2 to MusicXML conversion (courtesy of Mogens Lundholm)

#### SymbTr-extras v0.3.2
 - Updated makammusicbrainz package version

#### SymbTr-extras v0.3.1
 - Updated required packages
 - Added rest row correction

#### SymbTr-extras v0.3.0
 - Improved code quality
 - Added unittests
 - Upgraded the required symbtrdataextractor to v2.0.0

#### SymbTr-extras v0.3.dev
 - Upgraded the required symbtrdataextractor to v2.0.0-alpha.5

#### SymbTr-extras v0.2.dev
 - Improved SymbTr MBID matching

#### SymbTr-extras v0.1
 - First public release