2018-10-24   Shuo Chen  <chenshuo@chenshuo.com>
  * First release of C++11 version of muduo.
  * Forked after v1.0.9, e6c04c43 is the base. changes in cpp98 branch are integrated
  * Replace boost::shared_ptr/boost::weak_ptr with std::shared_ptr/std::weak_ptr.
  * Replace boost::function/boost::bind with std::function/std::bind/lambda.
  * Replace boost::ptr_vector<T> with std::vector<std::unique_ptr<T>>.
  * Replace boost::noncopyable with muduo::noncopyable.
  * Replace boost::scoped_ptr with std::unique_ptr.
  * Replace BOOST_STATIC_ASSERT with static_assert.
  * Replace boost type_traits with std type_traits.
  * Version 2.0.0