update readme

README.md

@@ -69,7 +69,7 @@ Openly available for any usage:
 * **head_muscles**: masseter_right, masseter_left, temporalis_right, temporalis_left, lateral_pterygoid_right, lateral_pterygoid_left, medial_pterygoid_right, medial_pterygoid_left, tongue, digastric_right, digastric_left
 * **headneck_bones_vessels**: larynx_air, thyroid_cartilage, hyoid, cricoid_cartilage, zygomatic_arch_right, zygomatic_arch_left, styloid_process_right, styloid_process_left, internal_carotid_artery_right, internal_carotid_artery_left, internal_jugular_vein_right, internal_jugular_vein_left (cite [paper](https://www.mdpi.com/2072-6694/16/2/415))
 * **headneck_muscles**: sternocleidomastoid_right, sternocleidomastoid_left, superior_pharyngeal_constrictor, middle_pharyngeal_constrictor, inferior_pharyngeal_constrictor, trapezius_right, trapezius_left, platysma_right, platysma_left, levator_scapulae_right, levator_scapulae_left, anterior_scalene_right, anterior_scalene_left, middle_scalene_right, middle_scalene_left, posterior_scalene_right, posterior_scalene_left, sterno_thyroid_right, sterno_thyroid_left, thyrohyoid_right, thyrohyoid_left, prevertebral_right, prevertebral_left (cite [paper](https://www.mdpi.com/2072-6694/16/2/415))
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+* **liver_vessels**: liver_vessels, liver_tumor (cite [paper](https://arxiv.org/abs/1902.09063))*
 
 *: These models are not trained on the full totalsegmentator dataset but on some small other datasets. Therefore, expect them to work less robustly.