Slightly improve README snippet formatting

Author: doonv

README.md

@@ -38,10 +38,12 @@ to a pixel grid. It works by moving the canvas in the opposite direction of the
     use bevy::prelude::*;
     use bevy_smooth_pixel_camera::prelude::*;
     
-    App::new().add_plugins((
-        DefaultPlugins.set(ImagePlugin::default_nearest()),
-        PixelCameraPlugin
-    )).run();
+    App::new()
+        .add_plugins((
+            DefaultPlugins.set(ImagePlugin::default_nearest()),
+            PixelCameraPlugin,
+        ))
+        .run();
     ```
 
 3. Add a [`PixelCamera`](https://docs.rs/bevy_smooth_pixel_camera/latest/bevy_smooth_pixel_camera/components/struct.PixelCamera.html) to your world.

src/lib.rs

@@ -25,10 +25,12 @@
 //!     use bevy::prelude::*;
 //!     use bevy_smooth_pixel_camera::prelude::*;
 //!     
-//!     App::new().add_plugins((
-//!         DefaultPlugins.set(ImagePlugin::default_nearest()),
-//!         PixelCameraPlugin
-//!     )).run();
+//!     App::new()
+//!         .add_plugins((
+//!             DefaultPlugins.set(ImagePlugin::default_nearest()),
+//!             PixelCameraPlugin,
+//!         ))
+//!         .run();
 //!     ```
 //!
 //! 3. Add a [`PixelCamera`](crate::components::PixelCamera) to your world.