Rails upgrade

Upgrade `activesupport` to version 5.2 to make it compatible with Rails
5.2.6

Author: brunofrank

legality.gemspec

@@ -17,5 +17,5 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency 'activesupport', '~> 4.1'
+  spec.add_dependency 'activesupport', '>= 4.1'
 end