maint: Grammar fix to mailmap

Make the sentence read better.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20181207170733.129532-1-eblake@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
1 file changed