📝 Update release notes

because it was actually a LOT of work to *not* break changes

Author: tiangolo

docs/release-notes.md

@@ -3,7 +3,7 @@
 
 ## 0.4.0
 
-### Features - Breaking Changes
+### Features
 
 * ✨ Add support for Click 8 while keeping compatibility with Click 7. PR [#317](https://github.com/tiangolo/typer/pull/317) by [@tiangolo](https://github.com/tiangolo).