Update VinVL_MODEL_ZOO.md non-functioning captioning script

[or-toledano]

Fixes #143

[SYSUmrlian]

i write down this line: --model_name_or_path pretrained_models/image_captioning/pretrained_base/checkpoint-2000000 but still raise assertionserror: File "oscar/run captioninq.py", line 330, in build dataset assert op.isfile(yaml file)