message: Fix inaccurate code sample in graphics
diff: @@ -9,8 +9,7 @@ npm install @pixi/graphics
  ## Usage
  ```js
  -import { GraphicsRenderer } from '@pixi/graphics';
  -import { Renderer } from '@pixi/core';
  +import { Graphics } from '@pixi/graphics';
  -Renderer.registerPlugin('graphics', GraphicsRenderer);
  +const shapes = new Graphics();
  ```
  