trying to fix CSV not found error on heroku

app/controllers/cities_autocomplete_controller.rb

@@ -1,4 +1,3 @@
-require 'CSV'
 class CitiesAutocompleteController < ApplicationController
   skip_before_action :verify_authenticity_token
 

config/application.rb

@@ -10,6 +10,7 @@ require 'action_mailer/railtie'
 require 'action_view/railtie'
 require 'sprockets/railtie'
 # require "rails/test_unit/railtie"
+require 'csv'
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.