There is no more

public Configuration()
{
    AutomaticMigrationsEnabled = false;
}

in Entity Framework Core 1.0 (formerly  EF 7.0)

Now you can use extension Migrate method during database initialization.

For example, you have custom DBInitializer class:

public class DBInitialization
{
    public static void Initialize()
    {
        using (var context = new DbContext())
        {
            context.Database.Migrate();
           
            // Other db initialization code.
        }
    }
}

There is also async version of this method. This method will apply any pending migrations.

You can call DBInitialization.Initialize at the end of Configure method at Startup class.