Update CHANGELOG.md

Author: brizental

CHANGELOG.md

@@ -12,6 +12,8 @@
 * [#658](https://github.com/mozilla/glean.js/pull/658): BUGFIX: Unblock ping uploading jobs after the maximum of upload failures are hit for a given uploading window.
 * [#661](https://github.com/mozilla/glean.js/pull/661): Include unminified version of library on Qt/QML builds.
 * [#647](https://github.com/mozilla/glean.js/pull/647): Implement the Text metric type.
+* [#681](https://github.com/mozilla/glean.js/pull/681): BUGFIX: Fix error in scanning events database upon initialization on Qt/QML.
+  * This bug prevents the changes introduced in [#526](https://github.com/mozilla/glean.js/pull/526) from working properly.
 
 # v0.18.1 (2021-07-22)