Update CREDITS.TXT

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@163949 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index 948c31a..3d9e841 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -62,3 +62,7 @@
 N: Michel Morin
 E: mimomorin@gmail.com
 D: Minor patches to is_convertible.
+
+N: Dimitry Andric
+E: dimitry@andric.com
+D: Visibility fixes, minor FreeBSD portability patches.