fix  warning
@@ -5,7 +5,7 @@ use pathfinder_svg::BuiltSVG;
use pathfinder_pdf::make_pdf;
use usvg::{Tree, Options};
-fn main() -> Result<(), Box<Error>> {
+fn main() -> Result<(), Box<dyn Error>> {
let mut args = std::env::args().skip(1);
let input = args.next().expect("no input given");
let output = args.next().expect("no output given");
