Improved documentation about upgrade process

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog Fab-manager
 
 - Ability to configure until when the events are shown on the home page
+- Improved documentation about upgrade process
 - Fix a bug: managers cannot see passed events
 - [TODO DEPLOY] `rails db:seed`
 

doc/production_readme.md

@@ -157,7 +157,9 @@ Then, you'll need to perform the upgrade with the following command:
 
 *This procedure updates Fab-manager to the most recent version by default.*
 
-> ⚠ If you are upgrading from a very outdated version, you must first upgrade to v2.8.3, then to v3.1.2 and finally to the last version
+> ⚠ If you are upgrading from a very outdated version, you must first upgrade to v2.8.3, then to v3.1.2, then to 4.0.4 and finally to the last version
+
+> ⚠ With versions < 4.3.3, you must replace `bundle exec rails` with `bundle exec rake` in all the commands above
 
 <a name="steps"></a>
 ### Steps

doc/upgrade_v1.md

@@ -3,7 +3,7 @@
 Steps to follow:
 - Dump database of v1
 - Make a gzipped tarball of public/uploads
-- Install Fab-manager v4.3.4+
+- Install Fab-manager v4.3.4 or above
 - Restore the DB dump in the new postgres instance
 - Open a psql shell, then:
   ```sql