inserted information about upgrading the nightscout branch if necessary (#184)
inserted information about upgrading the nightscout branch if necessary (#184)

@logichammer asked for inserting some information on how to update Nightscout to the dev branch. I think that this step belongs to the chapter visualization and monitoring and added a sentence here. If you are just changing the branch of Nightscout you shoul be familiar with the necessary steps. That is why I decided to make just a brief note.
Pazoles/docs,danamlewis/docs,sarahspins/docs,danamlewis/docs,openaps/docs,jbwittmer/docs,Jieseldeep/docs,dakago/docs