Add todo for deprecated user routes and more information about deprecation to changelog

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

CHANGELOG

@@ -78,6 +78,7 @@ v 8.13.0 (unreleased)
   - Replace bootstrap caret with fontawesome caret (ClemMakesApps)
   - Fix unnecessary escaping of reserved HTML characters in milestone title. !6533
   - Add organization field to user profile
+  - Change user pages routing from /u/:username/PATH to /users/:username/PATH. Old routes will redirect to the new ones for the time being.
   - Fix enter key when navigating search site search dropdown. !6643 (Brennan Roberts)
   - Fix deploy status responsiveness error !6633
   - Make searching for commits case insensitive
@@ -102,7 +103,6 @@ v 8.13.0 (unreleased)
   - Fix a typo in doc/api/labels.md
   - API: all unknown routing will be handled with 404 Not Found
   - Make guests unable to view MRs on private projects
-  - Change user pages routing from /u/:username/PATH to /users/:username/PATH
 
 v 8.12.6
   - Update mailroom to 0.8.1 in Gemfile.lock  !6814

config/routes/user.rb

@@ -34,7 +34,9 @@ scope(path: 'users/:username',
 end
 
 # Compatibility with old routing
+# TODO (dzaporozhets): remove in 10.0
 get '/u/:username', to: redirect('/%{username}'), constraints: { username: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ }
+# TODO (dzaporozhets): remove in 9.0
 get '/u/:username/groups', to: redirect('/users/%{username}/groups'), constraints: { username: /[a-zA-Z.0-9_\-]+/ }
 get '/u/:username/projects', to: redirect('/users/%{username}/projects'), constraints: { username: /[a-zA-Z.0-9_\-]+/ }
 get '/u/:username/snippets', to: redirect('/users/%{username}/snippets'), constraints: { username: /[a-zA-Z.0-9_\-]+/ }