Relax rails dependency

Author: y-yagi

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', '< 5.2'
+  s.add_dependency 'railties',        '>= 4.0.0', '< 6'
   s.add_dependency 'sass',            '~> 3.4'
   s.add_dependency 'sprockets-rails', '< 4.0'
   s.add_dependency 'sprockets',       '~> 4.x'

test/fixtures/engine_project/engine_project.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.rdoc"]
   s.test_files = Dir["test/**/*"]
 
-  s.add_dependency "rails", ">= 4.0.0.beta", "< 5.2"
+  s.add_dependency "rails", ">= 4.0.0.beta", "< 6"
   # s.add_dependency "jquery-rails"
 
   s.add_development_dependency "sqlite3"