Label change 'contradictory' to 'contradiction' issue

[raqoon886]

in the original MNLI and XNLI paper, labels when two sentences contradict are named as 'contradiction',

but in the XNLI 1.0.zip, the labels are 'contradictory' instead of 'contradiction'. (for all languages)

it can be a problem when training multiple languages at once.

i think changing label 'contradictory' to 'contradiction' would be proper.