Update changelog for 4.9.

debian/changelog

 tails (4.9) UNRELEASED; urgency=medium
 
-  * Dummy entry for next release.
+  * Security fixes
+    - Upgrade Tor Browser to 9.5.3-build1 (Closes: #17827).
+    - Upgrade Linux to 5.7.0-1 at 5.7.6-1 (Closes: #17786).
+
+  * Bugfixes
+    - Fix quoting issue triggering problems with some administration
+      passwords (Closes: #17792).
+    - Fix toram boot option by not starting the tails-shutdown-on-media-removal
+      service unit in that case (Closes: #17800).
+    - Fix keyboard setting handling in the greeter (Closes: #17794).
+    - Make sure log messages can be displayed by Plymouth, which has strict
+      limits, and improve parsing in tails-gdm-error-message (Closes: #17533).
+
+  * Minor improvements and updates
+    - Ensure MAC spoofing messages are translated (Closes: #17783).
+    - Improve failure handling for MAC spoofing (Closes: #17784).
+    - Trigger MAC spoofing "panic" mode when the debug=test_mac_spoof_panic boot
+      option is set.
+
+  * Build system
+    - Automate post-release GitLab updates, using gitlab-triage (Closes: #17589).
+    - Fix a lot of possible problems spotted by ShellCheck, thanks to Paul Wise.
+    - Stop installing custom firmware: firmware-realtek 20200421-1 includes it
+      (See: #17786, #17323).
+    - Update Thunderbird patches (Closes: #6156, #17808).
+    - Bump snapshot of the Debian archive to 2020071801 (Closes: #17786).
 
- -- anonym <anonym@riseup.net>  Wed, 01 Jul 2020 11:05:21 +0200
+  * Test suite
+    - Add shell-special chars to passwords (See: #17792).
+    - Always test the Unsafe Browser in Farsi.
+    - Fix support for symlinks (Closes: #17547).
+    - Update persistence-setup test suite for a new preset in Welcome Screen
+      settings.
+    - Drop Thunderbird POP3 test.
+    - Make the "the Tor Browser has started" step stricter.
+    - Improve error output when the Unsafe Browser fails to start in some locale.
+
+ -- Tails developers <tails@boum.org>  Mon, 27 Jul 2020 06:25:00 +0200
 
 tails (4.8) unstable; urgency=medium