Require 'active_support/core_ext/module/aliasing' in the infinite_comparable module
Merge pull request #8780 from diogomafra/require_core_ext

Require 'active_support/core_ext/module/aliasing' in the infinite_comparable module

When requiring 'active_support/core_ext', the following error is raised:

   undefined method `alias_method_chain' for Date:Class (NoMethodError)

Adding the missing require to this module fixes the problem.