Merge pull request #8098 from Rylan12/changelog-add-blog-link

Add link to Homebrew Blog in CHANGELOG.md

CHANGELOG.md

 See Homebrew's [releases on GitHub](https://github.com/Homebrew/brew/releases) for the changelog.
+
+Release notes for major and minor releases can also be found in the [Homebrew blog](https://brew.sh/blog/).