Migrate databases (part 2)!

Topics:

• Use PostgreeSQL with Docker container;
• Create an script to up Docker container with PostgreeSQL;
• Change DATABASE_URI;
• Add new field year of serie on TVSerie model;
• Explain db init, db migrate, db upgrade and db downgrade;

See video:

• https://www.youtube.com/watch?v=t4dGoI4S4SE