Add entry to mailmap

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

Author: medismailben

.mailmap

@@ -36,6 +36,8 @@ Jon Roelofs <jonathan_roelofs@apple.com> <jonathan@codesourcery.com>
 Jon Roelofs <jonathan_roelofs@apple.com> <jroelofs@jroelofs.com>
 LLVM GN Syncbot <llvmgnsyncbot@gmail.com>
 Martin Storsjö <martin@martin.st>
+Med Ismail Bennani <ismail@bennani.ma> <m.i.b@apple.com>
+Med Ismail Bennani <ismail@bennani.ma> <medismail.bennani@gmail.com>
 Ramkumar Ramachandra <r@artagnon.com> <artagnon@gmail.com>
 Saleem Abdulrasool <compnerd@compnerd.org>
 Tommy Chiang <ty1208chiang@gmail.com> <oToToT@users.noreply.github.com>