Symlog scale does not work with mpl-scatter-density

[fabienpaulot]

Hello,
first off thanks for developing such a useful tool.

I am trying to make a density plot using mpl-scatter-density and rescale the xaxis using the symlog scale. This scale is available with matplotlib but it fails when using mpl-scatter-density.

I am not sure how to address this issue.

Thanks

To reproduce the issue

fig=plt.figure()

x=np.linspace(1,10,100)

ax=fig.add_subplot(1, 1, 1,projection='scatter_density')
ax.scatter_density(x,x)
ax.set_xscale('symlog')

error: ValueError: Unexpected xscale: symlog