Changelog updated. Added migrate docs for 6.0

CHANGELOG

+v 6.0.0
+  - Epic: Replace teams with group membership
+  - Add project filter on dashboard
+  - cache project graph
+  - Drop support of root namespaces
+  - Redesign project settings navigation
+  - Restlyed login screen
+  - Default theme is classic now
+  - Cache result of methods like authorize_projects, project.team.members etc
+  - Remove $.ready events
+  - Fix onclick events being double binded
+  - Add notification level to group membership
+  - Move all project controllers/views under Projects:: module
+  - Move all profile controllers/views under Profiles:: module
+  - Redesign ssh keys page
+  - Generate fingerprint for ssh keys
+  
+
 v 5.3.0
   - Refactored services 
   - Campfire service added

doc/update/5.4-to-6.0.md

+# From 5.4 to 6.0
+
+### 0. Backup
+
+It's useful to make a backup just in case things go south:
+(With MySQL, this may require granting "LOCK TABLES" privileges to the GitLab user on the database version)
+
+```bash
+cd /home/git/gitlab
+sudo -u git -H RAILS_ENV=production bundle exec rake gitlab:backup:create
+```
+
+### 1. Stop server
+
+    sudo service gitlab stop
+
+### 2. Get latest code
+
+```bash
+cd /home/git/gitlab
+sudo -u git -H git fetch
+sudo -u git -H git checkout 6-0-dev
+```
+
+### 3. Install libs, migrations, etc.
+
+```bash
+cd /home/git/gitlab
+
+# MySQL
+sudo -u git -H bundle install --without development test postgres --deployment
+
+#PostgreSQL
+sudo -u git -H bundle install --without development test mysql --deployment
+
+sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_groups RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_global_projects RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_global_keys RAILS_ENV=production
+
+```
+
+### 4. Update config files
+
+* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/gitlab.yml.example but with your settings.
+* Make `/home/git/gitlab/config/puma.rb` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/puma.rb.example but with your settings.
+
+### 5. Update Init script
+
+```bash
+sudo rm /etc/init.d/gitlab
+sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/5-3-stable/lib/support/init.d/gitlab
+sudo chmod +x /etc/init.d/gitlab
+```
+
+### 6. Start application
+
+    sudo service gitlab start
+    sudo service nginx restart
+
+### 7. Check application status
+
+Check if GitLab and its environment are configured correctly:
+
+    sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
+
+To make sure you didn't miss anything run a more thorough check with:
+
+    sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
+
+If all items are green, then congratulations upgrade complete!