Add Rails release to ActiveRecord::Migration

plugins/documents/db/migrate/20160220000000_create_documents.rb

@@ -1,4 +1,4 @@
-class CreateDocuments < ActiveRecord::Migration
+class CreateDocuments < ActiveRecord::Migration[4.2]
   def self.up
     create_table :documents do |t|
       t.string :name

plugins/documents/db/migrate/20171105000000_add_parent_to_document.rb

@@ -1,4 +1,4 @@
-class AddParentToDocument < ActiveRecord::Migration
+class AddParentToDocument < ActiveRecord::Migration[4.2]
   def change
     add_reference :documents, :parent, index: true
   end

plugins/links/db/migrate/20181203000000_create_links.rb

@@ -1,4 +1,4 @@
-class CreateLinks < ActiveRecord::Migration
+class CreateLinks < ActiveRecord::Migration[4.2]
   def change
     create_table :links do |t|
       t.string :name, null: false

plugins/messages/db/migrate/20090120184410_create_messages.rb.skip

@@ -5,7 +5,7 @@
 # attempt to create an already existing messages table.
 #
 # extracted from 20090120184410_road_to_version_three.rb
-class CreateMessages < ActiveRecord::Migration
+class CreateMessages < ActiveRecord::Migration[4.2]
   def self.up
     create_table :messages do |t|
       t.references :sender

plugins/messages/db/migrate/20160226000000_add_email_to_message.rb

@@ -1,4 +1,4 @@
-class AddEmailToMessage < ActiveRecord::Migration
+class AddEmailToMessage < ActiveRecord::Migration[4.2]
   def change
     add_column :messages, :salt, :string
     add_column :messages, :received_email, :binary, :limit => 1.megabyte

plugins/polls/db/migrate/20181110000000_create_polls.rb

@@ -1,4 +1,4 @@
-class CreatePolls < ActiveRecord::Migration
+class CreatePolls < ActiveRecord::Migration[4.2]
   def change
     create_table :polls do |t|
       t.integer :created_by_user_id, null: false

plugins/polls/db/migrate/20181120000000_increase_choices_size.rb

@@ -1,4 +1,4 @@
-class IncreaseChoicesSize < ActiveRecord::Migration
+class IncreaseChoicesSize < ActiveRecord::Migration[4.2]
   def up
     change_column :polls, :choices, :text, limit: 65535
   end

plugins/printer/db/migrate/20181201000000_create_printer_jobs.rb

@@ -1,4 +1,4 @@
-class CreatePrinterJobs < ActiveRecord::Migration
+class CreatePrinterJobs < ActiveRecord::Migration[4.2]
   def change
     create_table :printer_jobs do |t|
       t.references :order

plugins/wiki/db/migrate/20090325175756_create_pages.rb

@@ -1,4 +1,4 @@
-class CreatePages < ActiveRecord::Migration
+class CreatePages < ActiveRecord::Migration[4.2]
   def self.up
     create_table :pages do |t|
       t.string :title