This time, we are goint to paint the points for the same scatter plot in respect to the 'hdi' column values.

1. Initialize a scatter plot with the next parameters:
   • Set points color (c) to the 'hdi' column values of the data;
   • Set colormap (cmap) to 'plasma'.

   Save the call of the .scatter() function to the cax variable.

2. Apply .colorbar() function to Figure object assigning cax as an argument.