Update changelog for version 0.2.1
Update changelog for version 0.2.1

skywinder/GaugeKit,mokagio/GaugeKit,skywinder/GaugeKit,bryanmikaelian/GaugeKit,mokagio/GaugeKit,lammertw/GaugeKit,mokagio/GaugeKit,bryanmikaelian/GaugeKit,bryanmikaelian/GaugeKit,DrGo/GaugeKit,lammertw/GaugeKit,DrGo/GaugeKit,lammertw/GaugeKit