Update C++2a status and add Glen to CREDITS.TXT. Reviewed as https://reviews.llvm.org/D40379

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318919 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index 92123d7..88d923a 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -41,6 +41,10 @@
 E: jbcoe@me.com
 D: Implementation of propagate_const.
 
+N: Glen Joseph Fernandes
+E: glenjofe@gmail.com
+D: Implementation of to_address.
+
 N: Eric Fiselier
 E: eric@efcs.ca
 D: LFTS support, patches and bug fixes.