Remove upper limit for railties

Co-Authored-By: jacobbednarz <[email protected]>

Author: rafaelfranca

sass-rails.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.description = %q{Sass adapter for the Rails asset pipeline.}
   s.license     = %q{MIT}
 
-  s.add_dependency 'railties',        '>= 4.0.0', '< 7'
+  s.add_dependency 'railties',        '>= 4.0.0'
   s.add_dependency 'sass',            '~> 3.4'
   s.add_dependency 'sprockets-rails', '< 4.0'
   s.add_dependency 'sprockets',       '~> 4.x'