custom.rb in convenient_service-0.6.0

- old
+ new

@@ -12,5 +12,6 @@
 require_relative "custom/have_attr_reader"
 require_relative "custom/have_attr_writer"
 require_relative "custom/include_module"
 require_relative "custom/prepend_module"
 require_relative "custom/results"
+require_relative "custom/singleton_prepend_module"