run_squad_w_distillation update
## 🐛 Bug

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Model I am using (Bert, XLNet....): DistilBERT and BERT

Language I am using the model on (English, Chinese....): English

The problem arise when using:
* [ ] the official example scripts: run_squad_w_distillation.py

The tasks I am working on is:
* [ ] an official GLUE/SQUaD task: SQuAD

## To Reproduce

Steps to reproduce the behavior:

1. Fine tuning on question answering from BERT to DistilBERT

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## Expected behavior
The files  utils_squad and utils_squad_evaluate are missing right now, so to make this script working I had to restore the files from previous version of this repo. What I expected is to use the script without using tricks

## Environment

* OS: Ubuntu 16.04
* Python version: 3.5.6
* PyTorch version: 1.3.1
* Using GPU nvidia P100 (2x) or 1080Ti

## Additional context

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
