Fixed error where Django can't connect to Postgres because psycopg2 is not installed

I was following the 'Get started with Django' guide and stumbled across an error when Django tries to run for the first time. It cannot connect to the Postgres instance as Psycopg Python library is not installed. The alternative is to install the libpq-dev package then pip install psycopg2 but this is cleaner and quicker.