------------------- * fixes for MySQL * add quarter time scale option * use native Django JSONField if awailable * tuning of time formats and small fixes
0.23.0
------------------- * choices can be set to be range dependant and limited by count
0.22.0
------------------- * fix hourly chart (sorting) * improve time labels on non-bar charts
0.21.1
------------------- * add default values for filter and multiple series
0.20.2
------------------ * fix charts not showing on admin index page