Deprecation warning for method keyword

[wd60622]

          > Model was fitted fine and had acceptable results.. I just wasn't able to use the plot_direct_contribution_curve using  method.. I ran this same exact code in version 0.6.0 and it worked fine..

mmm.plot_direct_contribution_curves(show_fit=True, method='sigmoid',xlim_max=3,same_axes=False)

Try it without the method keyword then. It seems to have been dropped as the fit curve will come from saturation specified at initialization.

@juanitorduz shall we go in an a deprecation? Was this a keyword arg up until this release?

Originally posted by @wd60622 in #804 (comment)