Update changelog

Author: DmitryAstafyev

changelog.md

@@ -5,6 +5,10 @@
 - Allow saving session state into a file (state includes: filters, charts, and disabled entities)
 - Allow import filters, charts, and disabled entities from a file into the current session.
 
+## Fixes
+
+- Fix drag & drop files
+
 # 3.15.3 (03.02.2025)
 
 ## Fixes