Update Readme.txt to correct error with update-rc.d

When typing the following:
sudo update-rc.d /etc/init.d/pimotion.sh defaults 
I received the following error:
update-rc.d: using dependency based boot sequencing
update-rc.d: error: unable to read /etc/init.d//etc/init.d/pimotion.sh
Readme amended so that the command reads as follows:
sudo update-rc.d pimotion.sh defaults