HarmTrace-Base-1.6.0.0: CHANGELOG.md

### Changelog 

1.4.0.1 HarmTrace-Base has been completely rewritten and is not compatible 
        with software that depends on HarmTrace-Base < 1.4. 
        
1.6.0.0 Lot's of minor updates.
  
  * More functions to represent musical time at the beat level
  * Stricktly adhere to the Harte shortands
  * Add the option to print chords with inversions represented as notes instead of intervals
  * Minor improvements