Update CHANGELOG.md

Author: brizental

CHANGELOG.md

@@ -3,6 +3,7 @@
 [Full changelog](https://github.com/mozilla/glean.js/compare/v0.3.0...main)
 
 * [#92](https://github.com/mozilla/glean.js/pull/92): Remove `web-ext-types` from `peerDependencies` list.
+* [#98](https://github.com/mozilla/glean.js/pull/98): Add external APIs for setting the Debug View Tag and Source Tags.
 * [#99](https://github.com/mozilla/glean.js/pull/99): BUGFIX: Add a default ping value in the testing APIs.
 
 # v0.3.0 (2021-02-24)