add changelog

CHANGELOG

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+2019-01-15 Version 1.1 
+Added tool to convert the grouping and step count without losing data or changing the music.
+Added selector for note names (different languages and GM-drums)
+Fixed "hanging notes" bug
+Entire program is now based on a common Laborejo-Software-Suite shared program template.
+Added "Save" to menu
+Many fixes and optimisations in the C engine. 
+
+2018-09-15 Version 1.0 
+Initial Release