Add Electron upgrade to changelog

Author: raksooo

CHANGELOG.md

@@ -29,6 +29,7 @@ Line wrap the file at 100 chars.                                              Th
 ### Changed
 - (Linux and macOS only) Update to DAITA v2. The main difference is that many different machines are
   provided by relays instead of a bundled list. The bundled `maybenot_machines` file was removed.
+- Update Electron from 30.0.4 to 33.2.1.
 
 ### Fixed
 #### macOS