This should stop at 20, although it will look like 200 because the custom styling makes the final 0.1 (1/10th) digit look like all the others.
[jellyfish_counter digits=3 digit_height=50 speed=100 digit_width=50 digit_padding=0 end=20 flat="true" digit_style="font-family: 'GothamRounded-Book',arial,helvetica,sans-serif;background:transparent;color:#000;" id='news']This will stop at 20 and should look like 020 because tenths have been disabled
[jellyfish_counter tenths="false" digits=3 digit_height=50 speed=100 digit_width=50 digit_padding=0 end=20 flat="true" digit_style="font-family: 'GothamRounded-Book',arial,helvetica,sans-serif;background:transparent;color:#000;" id='news']