fix deprecation warning

src/export.rs

@@ -163,7 +163,7 @@ fn render_obj(
         }
     }
 
-    let write_face_vertex = |sink: &mut io::Write, vertex_index| -> Result<(), ExportError> {
+    let write_face_vertex = |sink: &mut dyn io::Write, vertex_index| -> Result<(), ExportError> {
         if let Some(_) = output_mesh.normals() {
             try_write_mtl!(write!(
                 sink,

src/mesh.rs

@@ -19,7 +19,7 @@ use nalgebra::base::dimension::{U1, U4};
 use std::rc::Rc;
 
 /// A type for custom mesh vertices. Initialize with [vertex][self::vertex].
-pub type Vertex = nalgebra::Matrix<f32, U4, U1, nalgebra::MatrixArray<f32, U4, U1>>;
+pub type Vertex = nalgebra::Matrix<f32, U4, U1, nalgebra::ArrayStorage<f32, U4, U1>>;
 
 /// Initializes a vertex for a custom mesh.
 pub fn vertex(x: f32, y: f32, z: f32) -> Vertex {

src/rule.rs

@@ -234,5 +234,5 @@ impl ToRule for Rc<Mesh> {
 #[derive(Clone)]
 enum RuleInternal {
     Mesh(OutputMeshSource),
-    Invocations(Rc<ToRule>),
+    Invocations(Rc<dyn ToRule>),
 }