fix issue with sass 3.5.0

Author: bolandrm

lib/sassc/script/value_conversion.rb

@@ -47,7 +47,12 @@ def self.from_native(native_value, options)
             native_item = Native::list_get_value(native_value, index)
             from_native(native_item, options)
           end
-          Sass::Script::Value::List.new(items, :space)
+
+          if Gem.loaded_specs['sass'].version < Gem::Version.create('3.5')
+            Sass::Script::Value::List.new(items, :space)
+          else
+            Sass::Script::Value::List.new(items, separator: :space)
+          end
         else
           raise UnsupportedValue.new("Sass argument of type #{value_tag} unsupported")
         end

test/functions_test.rb

@@ -290,7 +290,12 @@ def returns_sass_list
         numbers = [10, 20, 30].map do |n|
           Sass::Script::Value::Number.new(n, '')
         end
-        Sass::Script::Value::List.new(numbers, :space)
+
+        if Gem.loaded_specs['sass'].version < Gem::Version.create('3.5')
+          Sass::Script::Value::List.new(numbers, :space)
+        else
+          Sass::Script::Value::List.new(numbers, separator: :space)
+        end
       end
 
       module Compass