message: Closes
  Remove the fs::File import and fout instance.
  image.save() now handles the saving and only needs 1 argument
diff: @@ -183,8 +183,6 @@ The image format is determined from the path's file extension.
  ```rust
  extern crate image;
  -use std::fs::File;
  -
  use image::GenericImage;
  fn main() {
  @@ -198,10 +196,8 @@ fn main() {
  // The color method returns the image's `ColorType`.
  println!("{:?}", img.color());
  - let ref mut fout = File::create("test.png").unwrap();
  -
  // Write the contents of this image to the Writer in PNG format.
  - img.save(fout, image::PNG).unwrap();
  + img.save("test.png").unwrap();
  }
  ```
  