add migration

db/migrate/20180316124944_add_maps_analysis_catalog_to_rate_limits.rb

@@ -0,0 +1,12 @@
+require 'carto/db/migration_helper'
+
+include Carto::Db::MigrationHelper
+
+migration(
+  Proc.new do
+    add_column :rate_limits, :maps_analysis_catalog, "integer[]"
+  end,
+  Proc.new do
+    drop_column :rate_limits, :maps_analysis_catalog
+  end
+)