Specify minimal possible rails release for migrations

db/migrate/001_create_suppliers.rb

@@ -1,4 +1,4 @@
-class CreateSuppliers < ActiveRecord::Migration
+class CreateSuppliers < ActiveRecord::Migration[4.2]
   SUPPLIER_SAMPLE = 'Sample Supplier'
   
   def self.up

db/migrate/002_create_articles.rb

@@ -1,4 +1,4 @@
-class CreateArticles < ActiveRecord::Migration
+class CreateArticles < ActiveRecord::Migration[4.2]
   def self.up
     create_table :articles do |t|
       t.column :name, :string, :null => false

db/migrate/003_add_list_to_article.rb

@@ -1,4 +1,4 @@
-class AddListToArticle < ActiveRecord::Migration
+class AddListToArticle < ActiveRecord::Migration[4.2]
   def self.up
     add_column :articles, :list, :string
     add_column :suppliers, :lists, :string

db/migrate/004_new_wording.rb

@@ -1,4 +1,4 @@
-class NewWording < ActiveRecord::Migration
+class NewWording < ActiveRecord::Migration[4.2]
   def self.up
     rename_column :articles, :refund, :deposit
     # and make 0.0 deposit the default ...

db/migrate/20110306172553_add_bnn_sync_to_suppliers.rb

@@ -1,4 +1,4 @@
-class AddBnnSyncToSuppliers < ActiveRecord::Migration
+class AddBnnSyncToSuppliers < ActiveRecord::Migration[4.2]
   def self.up
     add_column :suppliers, :bnn_sync, :boolean, :default => false
     add_column :suppliers, :bnn_host, :string

db/migrate/20120312184452_create_users.rb

@@ -1,4 +1,4 @@
-class CreateUsers < ActiveRecord::Migration
+class CreateUsers < ActiveRecord::Migration[4.2]
   def self.up
     create_table :users do |t|
       t.string :email

db/migrate/20120312190323_create_user_accesses.rb

@@ -1,4 +1,4 @@
-class CreateUserAccesses < ActiveRecord::Migration
+class CreateUserAccesses < ActiveRecord::Migration[4.2]
   def self.up
     create_table :user_accesses do |t|
       t.integer :user_id

db/migrate/20121013164501_remove_article_lists_from_suppliers.rb

@@ -1,4 +1,4 @@
-class RemoveArticleListsFromSuppliers < ActiveRecord::Migration
+class RemoveArticleListsFromSuppliers < ActiveRecord::Migration[4.2]
   def self.up
     remove_column :suppliers, :lists
     remove_column :articles, :list

db/migrate/20121017084147_add_admin_flag_to_users.rb

@@ -1,4 +1,4 @@
-class AddAdminFlagToUsers < ActiveRecord::Migration
+class AddAdminFlagToUsers < ActiveRecord::Migration[4.2]
   def self.up
     add_column :users, :admin, :boolean, :default => false
   end

db/migrate/20130627093146_add_category_to_article.rb

@@ -1,4 +1,4 @@
-class AddCategoryToArticle < ActiveRecord::Migration
+class AddCategoryToArticle < ActiveRecord::Migration[4.2]
   def self.up
     add_column :articles, :category, :string
   end

db/migrate/20170901183454_add_mail_sync_to_supplier.rb

@@ -1,4 +1,4 @@
-class AddMailSyncToSupplier < ActiveRecord::Migration
+class AddMailSyncToSupplier < ActiveRecord::Migration[4.2]
   def change
     add_column :suppliers, :mail_sync, :boolean
     add_column :suppliers, :mail_from, :string

db/migrate/20170901200146_add_salt_to_suppliers.rb

@@ -1,4 +1,4 @@
-class AddSaltToSuppliers < ActiveRecord::Migration
+class AddSaltToSuppliers < ActiveRecord::Migration[4.2]
 
   class Supplier < ActiveRecord::Base; end
 

db/migrate/20190811115732_generalize_ftp_sync_beyond_bnn.rb

@@ -1,4 +1,4 @@
-class GeneralizeFtpSyncBeyondBnn < ActiveRecord::Migration
+class GeneralizeFtpSyncBeyondBnn < ActiveRecord::Migration[4.2]
   def change
     rename_column :suppliers, :bnn_sync, :ftp_sync
     rename_column :suppliers, :bnn_host, :ftp_host