Suggestion: Symbol support

[lukasfronc]

Hi Roman,

is there any chance to support symbols also for this plug-in?

I know, it's little conflict symbols purpose and I don't have idea if its doable or Sketch is synchronising all instances of symbols over this, but I can imagine this function to synchronise symbols and let state differently, also use all benefits of symbols as file-size reduction by single instance of sources (bitmaps).

Thank you and thanks for this plug-in.