Bug-fixes:
- `draw_contour` now accepts an integer for `bound` keyword as advertised in the docs
- fixed wrong EDM goal in iminuit reports, was off by factor 5 in some
Interface:
- removed the undocumented keyword "args" in `(draw_)contour`, `(draw_)profile`
- removed misleading "show_sigma" keyword in `draw_contour`
- deprecated `Minuit.is_fixed`, replaced by `.fixed` attribute
- deprecated `Minuit.set_strategy`, assign to `Minuit.strategy` instead
- deprecated `Minuit.set_errordef`, assign to `Minuit.errordef` instead
- deprecated `Minuit.set_print_level`, assign to `Minuit.print_level` instead
- deprecated `Minuit.print_fmin`, `Minuit.print_matrix`, `Minuit.print_param`, `Minuit.print_initial_param`, `Minuit.print_all_minos`; use print() on the respective objects instead
Implementation:
- improved style of draw_contour, draw more contour lines
- increased default resolution for curves produced by `(draw_)mncontour`, `(draw_)contour`
- switched from internal copy of Minuit2 to including Minuit2 repository from GooFit
- build improvements for windows/msvc
- updated Minuit2 code to ROOT-v6.15/01 (compiler with C++11 support is now required to build iminuit)
- henryiii added support for building Python-3.8 wheels