Add CHANGELOG entry

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diff --git a/activestorage/CHANGELOG.md b/activestorage/CHANGELOG.md
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+*   Use the [ImageProcessing](https://github.com/janko-m/image_processing) gem
+    for Active Storage variants, and deprecate the MiniMagick backend.
+
+    This means that variants are now automatically oriented if the original
+    image was rotated. Also, in addition to the existing ImageMagick
+    operations, variants can now use `:resize_to_fit`, `:resize_to_fill`, and
+    other ImageProcessing macros. These are now recommended over raw `:resize`,
+    as they also sharpen the thumbnail after resizing.
+
+    The ImageProcessing gem also comes with a backend implemented on
+    [libvips](http://jcupitt.github.io/libvips/), an alternative to
+    ImageMagick which has significantly better performance than
+    ImageMagick in most cases, both in terms of speed and memory usage. In
+    Active Storage it's now possible to switch to the libvips backend by
+    changing `Rails.application.config.active_storage.variant_processor` to
+    `:vips`.
+
+    *Janko Marohnić*
+
 *   Rails 6 requires Ruby 2.4.1 or newer.
 
     *Jeremy Daer*