Add missing require for macroexp

Fixes #26.

ido-ubiquitous.el

@@ -49,6 +49,7 @@
 (require 'ido)
 (require 'advice)
 (require 'cl)
+(require 'macroexp)
 
 ;; Declare this ahead of time to quiet the compiler
 (defvar ido-ubiquitous-fallback-completing-read-function)