bump active record max version

paranoia.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
 
 
   s.required_ruby_version = '>= 2.0'
   s.required_ruby_version = '>= 2.0'
 
 
-  s.add_dependency 'activerecord', '>= 4.0', '< 5.1'
+  s.add_dependency 'activerecord', '>= 4.0', '< 5.2'
 
 
   s.add_development_dependency "bundler", ">= 1.0.0"
   s.add_development_dependency "bundler", ">= 1.0.0"
   s.add_development_dependency "rake"
   s.add_development_dependency "rake"