Export_fig embedded fonts in Matlab R2018a

Hi,

I'm trying to export a figure in PDF format with the Palatino and Cambria fonts.

The matlab code is as follows:
```Matlab
x = rand(4,2);
figure('color', 'w');
b = bar(x, 'barwidth', 0.9) ;
b(1).FaceColor = [ 0 0.4470 0.7410];
b(2).FaceColor = [ 0.6350 0.0780 0.1840];
set(gca, 'fontsize', 20, 'fontname', 'cambria', 'fontweight', 'bold', 'xticklabel', {'0-1', '2-5', '6-10', '>10'});
ylabel('Vertical Axis', 'fontname', 'palatino')
xlabel('Horizontal Axis', 'fontname', 'palatino')
leg = legend('Model', 'Data', 'Location', 'Northeast');
set(leg, 'box', 'off', 'fontname', 'palatino')
grid on
export_fig example -pdf -painters -nofontswap
```

This is the resulting figure: (note fonts have been altered)
[example.pdf](https://github.com/altmany/export_fig/files/2530699/example.pdf)

Am I doing something wrong?
Any help is greatly appreciated!