fix-#3-note-annotation-error

[RemyNtshaykolo]

resolve #3

[erenyenigul]

Hi @RemyNtshaykolo , I believe @panarch is not actively checking issues. I think current version of this package have some usability issues. Font pack idea is not really necessary, and even it may be good for custom fonts, defining a font pack for each font every time is not so easy. Also, this Vex.Merge issue makes it impossible to use the package without modification. I created another npm package, react-native-vexflow-canvas which is also inspired from this package. If you like to contribute, I would be happy.