Update CHANGELOG.md

Co-authored-by: Alessio Placitelli <alessio.placitelli@gmail.com>

Author: brizental

CHANGELOG.md

@@ -3,6 +3,7 @@
 [Full changelog](https://github.com/mozilla/glean.js/compare/v0.9.0...main)
 
 * [#219](https://github.com/mozilla/glean.js/pull/219): BUGFIX: Fix path to ping entry point in package.json.
+
 # v0.9.0 (2021-04-19)
 
 [Full changelog](https://github.com/mozilla/glean.js/compare/v0.8.1...v0.9.0)