support partial options tuple

Author: fonsp

src/PlutoPDF.jl

@@ -46,7 +46,9 @@ function html_to_pdf(html_path::AbstractString, output_path::Union{AbstractStrin
     output_path = something(output_path, Pluto.numbered_until_new(splitext(html_path)[1]; suffix=".pdf", create_file=false))
 
     @info "Generating pdf..."
-    cmd = `$(nodejs_cmd()) $bin_script $(abspath(html_path)) $(abspath(output_path)) $(JSON.json(options))`
+    cmd = `$(nodejs_cmd()) $bin_script $(abspath(html_path)) $(abspath(output_path)) $(JSON.json(
+        (; default_options..., options...)
+    ))`
     if console_output
         run(cmd)
     else