Fix old migrations failing because of new version of `strong_migrations` (#11018)

db/migrate/20180402040909_create_report_notes.rb

@@ -8,7 +8,7 @@ class CreateReportNotes < ActiveRecord::Migration[5.1]
       t.timestamps
     end
 
-    add_foreign_key :report_notes, :reports, column: :report_id, on_delete: :cascade
-    add_foreign_key :report_notes, :accounts, column: :account_id, on_delete: :cascade
+    safety_assured { add_foreign_key :report_notes, :reports, column: :report_id, on_delete: :cascade }
+    safety_assured { add_foreign_key :report_notes, :accounts, column: :account_id, on_delete: :cascade }
   end
 end