I’ve just added the bash commands you need to setup dataplicity log files to the standard emonPi rc.local so dataplicity will work out of the box for all emonPi users. You can now stash your changes and pull in the latest change and you will be good to go for automatic updates in the future:
rpi-rw
cd /home/pi/emonpi
git stash
git pull
rpi-ro
Then reboot to test dataplicity comes back online ok.
See my post on the dataplicity thread for more info: