annotate models (#2697)

* add annotate to Gemfile

* rails g annotate:install

* configure annotate_models

* add schema info to models

* fix rubocop to add frozen_string_literal

app/models/follow_request.rb

@@ -1,4 +1,14 @@
 # frozen_string_literal: true
+# == Schema Information
+#
+# Table name: follow_requests
+#
+#  id                :integer          not null, primary key
+#  account_id        :integer          not null
+#  target_account_id :integer          not null
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#
 
 class FollowRequest < ApplicationRecord
   include Paginable