Change README to reflect cplusplus location

Author: Beman

README

@@ -1,4 +1,8 @@
-This is an UNOFFICIAL repository for the LWG issues list.
+https://github.com/cplusplus/LWG is the repository for the C++ Standards Committee's
+Library Working Group issues lists files. 
 
-For official versions of the list, see http://www.open-std.org/jtc1/sc22/wg21/
- 
+For the most recent draft of the lists generated from these files,
+see http://cplusplus.github.com/LWG/lwg-active.html 
+
+For the official versions of these lists,
+see http://www.open-std.org/jtc1/sc22/wg21/