Add changelog

Author: Spone

docs/CHANGELOG.md

@@ -10,6 +10,10 @@ nav_order: 6
 
 ## main
 
+* Setup Trusted Publishing to RubyGems, to improve software supply chain safety.
+
+    *Hans Lemuet*
+
 ## 4.0.0.rc5
 
 * Revert change setting `#format`. In GitHub's codebase, the change led to hard-to-detect failures. For example, components rendered from controllers included layouts when they didn't before. In other cases, the response `content_type` changed, breaking downstream consumers. For cases where a specific content type is needed, use: