I'm attempting to write the text "Foo" to a blank window using Rust and `bevy = 0.10.1`. As of version 0.10, the way to update text for a spawned entity is by using the `text: Text::from_section(value, style)` submitted to `TextBundle` as noted here: https://docs.rs/bevy/latest/bevy/prelude/struct.TextBundle.html. However, nothing is ever drawn to the screen.
use bevy::math::Vec3;
use bevy::prelude::*;
fn main() {
  App::new()
    .add_plugins(DefaultPlugins)
    .add_startup_system(write_text)
    .run();
}
fn write_text(mut commands: Commands,) {     
    commands.spawn(Camera3dBundle::default());
    commands.spawn( TextBundle {
        
        text: Text::from_section("Foo", TextStyle {
        color: Color::WHITE,
        ..default()
        }),
        transform: Transform::from_translation(Vec3::new(4., 0., 4.)),
        ..default()
    });
}

fn write_text(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands.spawn(Camera3dBundle::default());
    commands.spawn(TextBundle {
        text: Text::from_section(
            "Foo",
            TextStyle {
                color: Color::WHITE,
                font: asset_server.load("fonts/FiraSans-Bold.ttf"),
                ..default()
            },
        ),
        transform: Transform::from_translation(Vec3::new(4., 0., 4.)),
        ..default()
    });
}