Add ChangeLog2

ChangeLog2

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+2018-??-?? Shuo Chen <[email protected]>
+ * First release of C++11 version of muduo.
+ * Forked after v1.0.9, e6c04c43 is the base.
+ * 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
+