v0.5.0

• Created the demo site https://django-slick-reporting.com/
• Add support to group by date field
• Add format_row hook to SlickReportingView
• Add support for several chart engine per same report
• Add SLICK_REPORTING_FORM_MEDIA &SLICK_REPORTING_DEFAULT_CHARTS_ENGINE setting.
• Documenting SlickReportView response structure.
• Fix issue with special column names __time_series__ and __crosstab__
• Fix issue with Crosstab reminder option.