Bump rails to 5.2 and update rubocop

db/migrate/20180324193210_create_guests.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateGuests < ActiveRecord::Migration[5.1]
   def change
     create_table :guests do |t|

db/migrate/20180324195736_create_active_admin_comments.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateActiveAdminComments < ActiveRecord::Migration::Current
   def self.up
     create_table :active_admin_comments do |t|

db/migrate/20180325090310_add_guest_info.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddGuestInfo < ActiveRecord::Migration[5.1]
   def change
     enable_extension('citext')

db/migrate/20180325135427_create_plus_ones.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreatePlusOnes < ActiveRecord::Migration[5.1]
   def change
     create_table :plus_ones do |t|

db/migrate/20180325202641_simplify_diet.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SimplifyDiet < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|

db/migrate/20180325212232_add_guest_notes.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddGuestNotes < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|

db/migrate/20180329080019_add_first_name_last_name_to_guest.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddFirstNameLastNameToGuest < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|

db/migrate/20180329080718_add_first_name_last_name_to_plus_one.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddFirstNameLastNameToPlusOne < ActiveRecord::Migration[5.1]
   def change
     change_table :plus_ones do |t|

db/migrate/20180329212947_add_confirmed_at_to_guests.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddConfirmedAtToGuests < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|

db/migrate/20180804103058_create_attendees.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateAttendees < ActiveRecord::Migration[5.1]
   def change
     create_view :attendees

db/seeds.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file should contain all the record creation needed to seed the database with its default values.
 # The data can then be loaded with the rails db:seed command (or created alongside the database with db:setup).
 #