- replaced HelloCharts library with the MPAndroidChart library
- added option to enable/disable graph legend
- replaced statistic last week/month table view with radar graph
- added rolling chart option
- added graph marker and marker menu for line graphs
- added option to enable/disable Y-axis
- change indicator color depending on if you are going towards or away from your weight goal
- fixed notification bug for Android O
- simplified Bluetooth machine state for improved Bluetooth communication