Update README.

Author: jbeder

README.md

@@ -44,7 +44,7 @@ cmake [-G generator] [-DBUILD_SHARED_LIBS=ON|OFF] ..
 
 # Recent Release #
 
-[yaml-cpp 0.5.3](https://github.com/jbeder/yaml-cpp/releases/tag/release-0.5.3) has been released! This is a bug fix release. It also will be the last release that uses Boost; futures releases will require C++11 instead.
+[yaml-cpp 0.6.0](https://github.com/jbeder/yaml-cpp/releases/tag/yaml-cpp-0.6.0) has been released! This release requires C++11, and no longer depends on Boost.
 
 [yaml-cpp 0.3.0](https://github.com/jbeder/yaml-cpp/releases/tag/release-0.3.0) is still available if you want the old API.