Update CHANGELOG.md

Author: aaronskiba

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Fix failing eslint workflow / upgrade `actions/checkout` & `actions/setup-node` to v3 [#3503](https://github.com/DMPRoadmap/roadmap/pull/3503)
 - Fix rendering of `confirm_merge` partial [#3515](https://github.com/DMPRoadmap/roadmap/pull/3515)
 - Remove Auto-Generated TinyMCE Skins and Add `public/tinymce/skins/` to `.gitignore` [#3466](https://github.com/DMPRoadmap/roadmap/pull/3466)
+- Update `database.yml.sample`: add separate test db [#3521](https://github.com/DMPRoadmap/roadmap/pull/3521)
 
 ## v5.0.0