Update file Matrix.php
As discussed on issue #25 "Function hook_civicrm_customFieldOptions has been removed from Core 5.78.0" we change the use of hook_civicrm_customFieldOptions for hook_civicrm_fieldOptions
As discussed on issue #25 "Function hook_civicrm_customFieldOptions has been removed from Core 5.78.0" we change the use of hook_civicrm_customFieldOptions for hook_civicrm_fieldOptions