flav-io/flavio v0.21

Most important changes since v0.20.4: Measurements New LHCb measurement of RK* Updated LHCb measurement of B0→K*μμ branching ratio to v2 of the preprint Replace 7 TeV and 8 TeV CMS measurement of B→K*μμ by their combination (thanks Ayan Paul for pointing us to it!) New features New function q2_plot_th_diff_err to plot theory predictions of q² dependent observables including error bands Uncertainy calculation using sm_uncertainty or np_uncertainty can now be done much faster in parallel using the optional threads argumen