Update changelog

Author: kimo-k

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 > Committed but unreleased changes are put here, at the top. Older releases are detailed chronologically below. 
 
+## 2.21.15 (2024-07-26)
+
+#### Changed
+
+- `dropdown` - Removed `:line-height` style from the theme. `:line-height` was left-over from old bootstrap css. Bootstrap used it to achieve a semblance of vertical centering of text in the anchor. Since we use a re-com box, we can do vertical centering in a nicer way.
+
 ## 2.21.14 (2024-07-25)
 
 #### Added