fix swag example for work with apex

README.md

@@ -442,12 +442,12 @@ python run_swag.py \
   --do_train \
   --do_lower_case \
   --do_eval \
-  --data_dir $SWAG_DIR/data
+  --data_dir $SWAG_DIR/data \
   --train_batch_size 16 \
   --learning_rate 2e-5 \
   --num_train_epochs 3.0 \
   --max_seq_length 80 \
-  --output_dir /tmp/swag_output/
+  --output_dir /tmp/swag_output/ \
   --gradient_accumulation_steps 4
 ```