Added PostgreSQL installation. (#1846)
Added PostgreSQL installation. (#1846)

PostgreSQL is needed to install dev-requirements.txt. Otherwise psycopg2 will fail.
PostgreSQL needs to run to be able to execute ./manage.py migrate
proevo/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,python/pythondotorg,python/pythondotorg,python/pythondotorg,python/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,manhhomienbienthuy/pythondotorg