Change the volunteer text, mention registration needed
Change the volunteer text, mention registration needed

Signed-off-by: Sayan Chowdhury <5f0367a2b3b757615b57f51d912cf16f2c0ad827@gmail.com>

PyConPune/pune.pycon.org,PyConPune/pune.pycon.org,PyConPune/pune.pycon.org