Update CREDITS.TXT

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@162647 91177308-0d34-0410-b5e6-96231b3b80d8

CREDITS.TXT

diff --git a/CREDITS.TXT b/CREDITS.TXT
index eedb4c9..948c31a 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -58,3 +58,7 @@
 N: Hyeon-bin Jeong
 E: tuhertz@gmail.com
 D: Minor patches and bug fixes.
+
+N: Michel Morin
+E: mimomorin@gmail.com
+D: Minor patches to is_convertible.