Update GLUE URLs (now hosted on FB)
Thanks for opening this PR :) 

We changed the name of the lib from nlp to datasets yesterday.
Could you rebase from master and re-generate the dataset_info.json file to fix the name changes ? Rebased changes here: https://github.com/huggingface/datasets/pull/626
NYU is switching dataset hosting from Google to FB. This PR closes https://github.com/huggingface/datasets/issues/608 and is necessary for https://github.com/jiant-dev/jiant/issues/161. This PR updates the data URLs based on changes made in https://github.com/nyu-mll/jiant/pull/1112.