style(rubocop): fix all safe auto correctable offenses

db/migrate/20200717083943_add_uuid_to_credentials.rb

@@ -1,8 +1,10 @@
 class AddUUIDToCredentials < ActiveRecord::Migration[5.2]
+
   def change
     add_column :credentials, :uuid, :string
     Credential.find_each do |c|
       c.update_column(:uuid, SecureRandom.uuid)
     end
   end
+
 end