Changelog entry for -ms prefixes on gradients and transforms.

doc-src/content/CHANGELOG.markdown

@@ -30,6 +30,8 @@ The Documentation for the [latest preview release](https://beta.compass-style.org
 * [CSS3] Made the API more consistent across the different mixins in the transitions module.
 * [CSS3] The text-shadow mixin now supports the spread parameter and it is used to progressively enhance browsers that support it.
 * [CSS3] Add a mixin for the unofficial `filter` property. [Docs](/reference/compass/css3/regions/)
+* [CSS3] Removed the `-ms` prefix for gradients and transforms.
+ Microsoft took so long to release them, that the spec was approved first.
 * [CLI] Added a `-I` option for adding sass import paths via the CLI during compilation and project set up.
 * [Configuration] For better ruby and rails integration, the `add_import_path` command now accepts
  [Sass::Importer](https://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html#custom_importers) objects