Updated Actor test with 'should' syntax to new 'expect' syntax.

Author: jdantonio

spec/concurrent/actor_spec.rb

@@ -241,7 +241,7 @@ def on_message(message)
         end
 
         it 'is evaluated by child' do
-          parent.ask!(1).should eq 2
+          expect(parent.ask!(1)).to eq 2
         end
       end