Fix breakage from dyn Trait

Author: petrochenkov

src/types.rs

@@ -652,7 +652,7 @@ impl Rewrite for ast::TraitRef {
 impl Rewrite for ast::Ty {
  fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
  match self.node {
- ast::TyKind::TraitObject(ref bounds) => bounds.rewrite(context, shape),
+ ast::TyKind::TraitObject(ref bounds, ..) => bounds.rewrite(context, shape),
  ast::TyKind::Ptr(ref mt) => {
  let prefix = match mt.mutbl {
  Mutability::Mutable => "*mut ",