It was not possible to set vmin and vmax for normalization of the cmap.
With this changes, now it is possible to choose those values when setting shading = {"normalization": [vmin, vmax]}
inside plot or subplot.
The solution given in #41 works only for the case of choosing vmin and vmax, and would fail when the user wants
vmin and vmax to be set automatically.
It was not possible to set vmin and vmax for normalization of the cmap. With this changes, now it is possible to choose those values when setting shading = {"normalization": [vmin, vmax]} inside plot or subplot.
The solution given in #41 works only for the case of choosing vmin and vmax, and would fail when the user wants vmin and vmax to be set automatically.