Add libc++abi note to ANNOUNCE.
@@ -8,7 +8,11 @@ programs.
Highlights of this release include:
--
+- Numerous improvements to the Objective-C++ exception interoperation code.
+ The runtime now dynamically detects whether the libcxxrt, libsupc++, or
+ libc++abi variant of the Itanium C++ Exception ABI is being used. This is
+ the first version to support exception interoperability with libc++abi.
+
You may obtain the code for this release from git and use the 2.2 branch:
