message: Add some missing parts to the changelog
  In particular also references the web page and blog.
diff: @@ -11,22 +11,28 @@ Rust image aims to be a pure-Rust implementation of various popular image format
  ### Version 0.22
  - The required Rust version is now `1.34.2`.
  +- Note the website and blog: [image-rs.org][1] and [blog.image-rs.org][2]
  - `PixelMut` now only on `ImageBuffer` and removed from `GenericImage`
  interface. Prefer iterating manually in the generic case.
  - Replaced an unsafe interface in the hdr decoder with a safe variant.
  - Support loading 2-bit BMP images
  +- Add method to save an `ImageBuffer`/`DynamicImage` with specified format
  - Update tiff to `0.3` with a writer
  -- Always use custom struct for ImageDecoder::Reader
  -- Added apply_without_alpha and map_without_alpha to Pixel trait
  +- Update png to `0.15`, fixes reading of interlaced sub-byte pixels
  +- Always use custom struct for `ImageDecoder::Reader`
  +- Added `apply_without_alpha` and `map_without_alpha` to `Pixel` trait
  - Pixel information now with associated constants instead of static methods
  - Changed color structs to tuple types with single component. Improves
  ergonomics of destructuring assignment and construction.
  -- Add lifetime bound on `ImageDecoder` trait.
  -- Remove unecessary 'static bounds on affine operations
  +- Add lifetime parameter on `ImageDecoder` trait.
  +- Remove unecessary `'static` bounds on affine operations
  - Add function to retrieve image dimensions without loading full image
  - Allow different image types in overlay and replace
  - Iterators over rows of `ImageBuffer`, mutable variants
  +[1]: https://www.image-rs.org
  +[2]: https://blog.image-rs.org
  +
  ### Version 0.21.2
  - Fixed a variety of crashes and opaque errors in webp
  