Sort imports with isort.

This is the result of:

    $ isort --recursive examples templates transformers utils hubconf.py setup.py

utils/download_glue_data.py

@@ -18,14 +18,15 @@ rm MSRParaphraseCorpus.msi
 2/11/19: It looks like SentEval actually *is* hosting the extracted data. Hooray!
 """
 
-import os
-import sys
-import shutil
 import argparse
+import os
+import shutil
+import sys
 import tempfile
 import urllib.request
 import zipfile
 
+
 TASKS = ["CoLA", "SST", "MRPC", "QQP", "STS", "MNLI", "SNLI", "QNLI", "RTE", "WNLI", "diagnostic"]
 TASK2PATH = {
     "CoLA": "https://firebasestorage.googleapis.com/v0/b/mtl-sentence-representations.appspot.com/o/data%2FCoLA.zip?alt=media&token=46d5e637-3411-4188-bc44-5809b5bfb5f4",