Sort imports with isort.

This is the result of:

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

examples/run_tf_glue.py

@@ -1,15 +1,18 @@
 import os
+
 import tensorflow as tf
+
 import tensorflow_datasets
 from transformers import (
+    BertConfig,
+    BertForSequenceClassification,
     BertTokenizer,
     TFBertForSequenceClassification,
-    BertConfig,
     glue_convert_examples_to_features,
-    BertForSequenceClassification,
     glue_processors,
 )
 
+
 # script parameters
 BATCH_SIZE = 32
 EVAL_BATCH_SIZE = BATCH_SIZE * 2