Fix some RubyCop offenses

db/migrate/20221124114030_create_status_reactions.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateStatusReactions < ActiveRecord::Migration[6.1]
   def change
     create_table :status_reactions do |t|

spec/models/status_reaction_spec.rb

@@ -1,5 +1,3 @@
-require 'rails_helper'
+# frozen_string_literal: true
 
-RSpec.describe StatusReaction, type: :model do
+require 'rails_helper'
-  pending "add some examples to (or delete) #{__FILE__}"
-end