Fix warning

Author: sebcrozet

src/render/systems.rs

@@ -3,9 +3,11 @@ use crate::physics::RapierConfiguration;
 use crate::render::ColliderDebugRender;
 use bevy::prelude::*;
 use bevy::render::mesh::{Indices, VertexAttributeValues};
-use bevy::sprite::MaterialMesh2dBundle;
 use rapier::geometry::ShapeType;
 
+#[cfg(feature = "dim2")]
+use bevy::sprite::MaterialMesh2dBundle;
+
 #[derive(Debug, Hash, PartialEq, Eq, Clone, SystemLabel)]
 pub enum RenderSystems {
     CreateColliderRenders,