message: fix example 01
diff: //! The simplest possible example that does something.
  #![allow(clippy::unnecessary_wraps)]
  -use ggez::graphics::{
  - self,
  - draw::DrawParam,
  - image::Image,
  - mesh::{Mesh, MeshBuilder},
  - text::{FontData, Text, TextLayout},
  - Color, Rect,
  -};
  use ggez::{
  - event, filesystem,
  + event,
  graphics::{
  + self,
  canvas::{Canvas, CanvasLoadOp},
  - image::{ImageFormat, ScreenImage},
  - sampler::Sampler,
  + draw::DrawParam,
  + image::ScreenImage,
  + mesh::{Mesh, MeshBuilder},
  + Color,
  },
  + Context, GameResult,
  };
  -use ggez::{Context, GameResult};
  use glam::*;
  struct MainState {
  @@ -62,7 +57,6 @@ impl event::EventHandler<ggez::GameError> for MainState {
  &mut ctx.gfx,
  CanvasLoadOp::Clear([0.1, 0.2, 0.3, 1.0].into()),
  &frame,
  - None,
  );
  canvas.draw_mesh(
  @@ -71,7 +65,7 @@ impl event::EventHandler<ggez::GameError> for MainState {
  DrawParam::new().offset(vec2(self.pos_x, 300.)),
  );
  - canvas.finish()?;
  + canvas.finish();
  ctx.gfx.present(&frame)?;
  Ok(())
  