Add another of my emails to mailmap

Because apparently I edited directly from Github and selected default email

Signed-off-by: Thomas Citharel <nextcloud@tcit.fr>

.mailmap

@@ -382,6 +382,7 @@ TheSFReader <TheSFReader@gmail.com>
 Thibaut GRIDEL <tgridel@free.fr>
 thomas <thomas@thomas-VirtualBox.(none)>
 Thomas Citharel <nextcloud@tcit.fr> Thomas Citharel <tcit@tcit.fr>
+Thomas Citharel <nextcloud@tcit.fr> Thomas Citharel <github@tcit.fr>
 Thomas Müller <thomas.mueller@tmit.eu> Thomas Mueller <thomas.mueller@tmit.eu>
 Thomas Müller <thomas.mueller@tmit.eu> Thomas Müller <DeepDiver1975@users.noreply.github.com>
 Thomas Olsen <tol@tanghus>