Prepare for v20.13 release

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>

debian/changelog

@@ -1,8 +1,41 @@
 freedombox (20.13) UNRELEASED; urgency=medium
 
+  [ Sunil Mohan Adapa ]
   * Rename source package from plinth to freedombox.
 
- -- Sunil Mohan Adapa <sunil@medhas.org>  Tue, 30 Jun 2020 17:25:38 -0700
+  [ Veiko Aasa ]
+  * minidlna: Do not expose statistics over public web
+
+  [ Benjamin Ortiz ]
+  * backups: Allow remote repository usernames to start with numbers
+
+  [ James Valleroy ]
+  * upgrades: Update apt cache before manual update
+  * upgrades: Parameterize backports dist name
+  * upgrades: Use current release codename when enabling backports
+  * upgrades: Use codename to pin freedombox from backports
+  * security: Move backports notice to security page
+  * upgrades: Add button to activate backports
+  * upgrades: Use only sources file to determine if backports enabled
+  * upgrades: Check that backports is for current release
+  * upgrades: Rewrite apt prefs file when activating backports
+  * upgrades: Enable backports for testing only in development mode
+  * upgrades: Show dist of backports to be activated
+  * upgrades: Split apt preferences into 2 files
+  * upgrades: Refactor use of lsb_release
+  * locale: Update translation strings
+  * doc: Fetch latest manual
+
+  [ Allan Nordhøy ]
+  * Translated using Weblate (Norwegian Bokmål)
+
+  [ Tang Zongxun ]
+  * Translated using Weblate (Chinese (Simplified))
+
+  [ Doma Gergő ]
+  * Translated using Weblate (Hungarian)
+
+ -- James Valleroy <jvalleroy@mailbox.org>  Mon, 13 Jul 2020 18:34:23 -0400
 
 plinth (20.12.1) unstable; urgency=high
 

plinth/__init__.py

@@ -3,4 +3,4 @@
 Package init file.
 """
 
-__version__ = '20.12.1'
+__version__ = '20.13'