fix migration file for rails 5

lib/generators/doorkeeper/application_owner_generator.rb

@@ -7,8 +7,9 @@ class Doorkeeper::ApplicationOwnerGenerator < Rails::Generators::Base
 
   def application_owner
     migration_template(
-      'add_owner_to_application_migration.rb',
-      'db/migrate/add_owner_to_application.rb'
+      'add_owner_to_application_migration.rb.erb',
+      'db/migrate/add_owner_to_application.rb',
+      migration_version: migration_version
     )
   end
 

lib/generators/doorkeeper/migration_generator.rb

@@ -7,8 +7,8 @@ class Doorkeeper::MigrationGenerator < ::Rails::Generators::Base
 
   def install
     migration_template(
-      'migration.rb',
-      'db/migrate/create_doorkeeper_tables.rb',
+      "migration.rb.erb",
+      "db/migrate/create_doorkeeper_tables.rb",
       migration_version: migration_version
     )
   end

lib/generators/doorkeeper/templates/add_owner_to_application_migration.rb → lib/generators/doorkeeper/templates/add_owner_to_application_migration.rb.erb

@@ -1,4 +1,4 @@
-class AddOwnerToApplication < ActiveRecord::Migration
+class AddOwnerToApplication < ActiveRecord::Migration<%= migration_version %>
   def change
     add_column :oauth_applications, :owner_id, :integer, null: true
     add_column :oauth_applications, :owner_type, :string, null: true

lib/generators/doorkeeper/templates/add_previous_refresh_token_to_access_tokens.rb

@@ -1,4 +1,4 @@
-class AddPreviousRefreshTokenToAccessTokens < ActiveRecord::Migration
+class AddPreviousRefreshTokenToAccessTokens < ActiveRecord::Migration<%= migration_version %>
   def change
     add_column(
       :oauth_access_tokens,