Adding fastlane file for version 0.4.0

Author: jmartinesp

fastlane/metadata/android/en-US/changelogs/40004000.txt

@@ -0,0 +1,13 @@
+Main changes in this version:
+
+- New timeline messages rendering.
+- Added support for user mentions.
+- Enabled chat backup so you can restore previous message history.
+- Added read receipts.
+- Several improvements to polls, including poll history.
+- Several UI/UX improvements.
+- Set a default power level to join room calls.
+- Added an option to disable notifications for invites.
+- Fixed a bug with the text composer and suggestions on Android 14.
+
+Full changelog: https://github.com/element-hq/element-x-android/releases