title: Add new columns to a existing database througt doctrine command Symfony
body: <p>I need help, I'm working in symfony, adn I created a database with 3 tables, but now I need to add some new columns into the tables, I created a new properties on the entity that I want to add them (new columns) into my tables. I installed the migrations Bundle but it doesn't work, I tried the schema uopdate as the documentation said and then I tried the migrations:diff and then the Migrate, and it seems like there is no changes to add to the entity/table, I'm very lost, could someone guide me please ? Is the private $usuario;</p>
  
  <pre><code>/**
   * @ORM\OneToOne(targetEntity="Usuario", inversedBy="user")
   * @ORM\JoinColumn(name="usuario_id", referencedColumnName="id")
   */
  private $usuario;
  </code></pre>