Add missing require to active_model/naming

Using `delegate` at L151 causes `NoMethodError`.
Adding `require` resolves this.

Author: okuramasafumi

activemodel/lib/active_model/naming.rb

@@ -3,6 +3,7 @@
 require "active_support/core_ext/hash/except"
 require "active_support/core_ext/module/introspection"
 require "active_support/core_ext/module/redefine_method"
+require "active_support/core_ext/module/delegation"
 
 module ActiveModel
   class Name