add David Turner's Two Sigma address

Signed-off-by: David Turner <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: novalis

.mailmap

@@ -48,6 +48,7 @@ David Kågedal <[email protected]>
 David Reiss <[email protected]> <dreiss@dreiss-vmware.(none)>
 David S. Miller <[email protected]>
 David Turner <[email protected]> <[email protected]>
+David Turner <[email protected]> <[email protected]>
 Deskin Miller <[email protected]>
 Dirk Süsserott <[email protected]>
 Eric Blake <[email protected]> <[email protected]>