Increase max cache size to 2MB

We have lots of votes in this edition of participatory budgets and the
default cache size (1MB) is not enough to hold certain cache fragments

config/environments/production.rb

@@ -55,7 +55,7 @@ Rails.application.configure do
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
   # Use a different cache store in production.
-  config.cache_store = :dalli_store
+  config.cache_store = :dalli_store, { value_max_bytes: 2000000 }
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.action_controller.asset_host = 'http://assets.example.com'