Fix deprecation warning method_missing

Fix deprecation warning on outdated method missing definition.

lib/v8/object.rb

@@ -52,7 +52,7 @@ class V8::Object
     end
   end
 
-  def respond_to?(method)
+  def respond_to?(method, include_all=false)
     super or self[method] != nil
   end
 
@@ -76,4 +76,4 @@ class V8::Object
       raise ArgumentError, "wrong number of arguments (#{args.length} for 0)" unless args.empty?
     end
   end
-end
+end