Release 0.15.3

[waywardmonkeys]

No description provided.

[DJMcNab]

I agree that this is probably sufficiently non-breaking.

Would it be worth the effort to run resvg's test suite with this version, to validate that the changes don't cause issues? I'm worried that some of the rounding changes could cause issues, although I think that would realistically only impact tests rather than actual users.

[waywardmonkeys]

Good call.

These break, but I think they're all unimportant, so once this releases, I'll fix things there:

failures:
    render::filters_feDropShadow_hsla_color
    render::filters_feSpecularLighting_lighting_color_eq_hsla
    render::filters_flood_color_hsla_color
    render::paint_servers_linearGradient_hsla_color
    render::paint_servers_radialGradient_hsla_color
    render::paint_servers_stop_hsla_color
    render::painting_fill_hsl_with_alpha
    render::painting_fill_hsla_with_percentage_s_and_l_values
    render::painting_fill_rgb_0_127_0_0_5
    render::painting_fill_rgba_0_127_0_0_5