Merge branch 'develop' of https://github.com/PaddlePaddle/PaddleHub into develop

demo/ernie-seq-labeling/run_fintune_with_hub.sh

-export CUDA_VISIBLE_DEVICES=5
+export CUDA_VISIBLE_DEVICES=0
 
 CKPT_DIR="./ckpt"
 

requirements.txt

 paddlepaddle >= 1.3.0
+visualdl >= 1.3.0
 pre-commit
 protobuf >= 3.1.0
 yapf == 0.26.0