Remove active model serializer and add tzinfo-data gem

Author: rosle

rails_docker/Gemfile.txt

@@ -5,7 +5,6 @@ ruby '2.6.2'
 gem 'rails', '5.2.3' # Latest stable
 gem 'pg' # Use Postgresql as database
 gem 'puma' # Use Puma as the app server
-gem 'active_model_serializers' # ActiveModel::Serializer implementation and Rails hooks
 gem 'mini_magick' # A ruby wrapper for ImageMagick or GraphicsMagick command line
 gem 'pagy' # A pagination gem that is very light and fast
 gem 'paranoia', '2.4.1' # Paranoia is a re-implementation of acts_as_paranoid for Rails 3 and Rails 4. Soft-deletion of records
@@ -74,3 +73,6 @@ end
 group :production do
   gem 'rack-timeout' # Rack middleware which aborts requests that have been running for longer than a specified timeout.
 end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]