Tyler.PlotConfig docs have broken example

The docstring has this example: ```julia using Tyler, GLMakie config = PlotConfig( preprocess = (data) -> data .+ 1, postprocess = (plot) -> translate!(plot, 0, 0, 1), color = :red ) lat, lon = (52.395593, 4.884704) delta = 0.1 extent = Extent(; X=(lon - delta / 2, lon + delta / 2), Y=(lat - delta / 2, lat + delta / 2)) Tyler.Map(extent; provider=Tyler.TileProviders.Esri(:WorldImagery), plot_config=config) ``` The last line generates many warnings and a blank plot: ``` ┌ Warning: error while creating tile │ exception = │ MethodError: no method matching +(::RGB{FixedPointNumbers.N0f8}, ::Int64) ... ```