Revert "Changing file that require is first used in."

This reverts commit 6f22dd23.

lib/rumoji.rb

 # -*- encoding: utf-8 -*-
 # -*- encoding: utf-8 -*-
 require "rumoji/version"
 require "rumoji/version"
 require "rumoji/emoji"
 require "rumoji/emoji"
-require "rumoji/extensions"
-require "rumoji/mixin"
-
 require 'stringio'
 require 'stringio'
 
 
 module Rumoji
 module Rumoji

lib/rumoji/emoji.rb

 # -*- encoding: utf-8 -*-
 # -*- encoding: utf-8 -*-
+
+require 'rumoji/mixin'
+require 'rumoji/extensions'
+
 module Rumoji
 module Rumoji
   class Emoji
   class Emoji