Merge pull request #327 from ko1/ractor_value

Use `Ractor#value` as `Ractor#take` is removed

Author: tompng

test/bigdecimal/test_ractor.rb

@@ -13,11 +13,15 @@ def test_ractor_shareable
     assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
     begin;
       $VERBOSE = nil
+      class Ractor
+        alias value take unless method_defined? :value
+      end
+
       require "bigdecimal"
       r = Ractor.new BigDecimal(Math::PI, Float::DIG+1) do |pi|
         BigDecimal('2.0')*pi
       end
-      assert_equal(2*Math::PI, r.take)
+      assert_equal(2*Math::PI, r.value)
     end;
   end
 end