Small bug

Hi, great work here.

I’ve found a small bug. In class-gp-pdf-template.php, line 261 it outputs post number instead of budget number. It should say:

<td><h3>' . __( "BUDGET No: ", 'gestion-pymes' ) .  get_post_meta( $budget_id, '_gp_budget_number', true)  . '</h3></td>

But it only says: $budget_id