.mailmap: specify spelling for Elie Tournier

Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
diff --git a/.mailmap b/.mailmap
index e146e5a..a31a817 100644
--- a/.mailmap
+++ b/.mailmap
@@ -144,6 +144,8 @@
 
 Edward O'Callaghan <funfunctor@folklore1984.net> <eocallaghan@alterapraxis.com>
 
+Elie Tournier <tournier.elie@gmail.com>
+
 Emeric Grange <emeric.grange@gmail.com> Emeric <emeric.grange@gmail.com>
 
 Emil Velikov <emil.l.velikov@gmail.com> <emil.velikov@collabora.com>