Fix Flask-SocketIO requirement to v0.6.0
Fix Flask-SocketIO requirement to v0.6.0

In v1.0, the gevent-socketio gunicorn worker can't be used anymore.

gheinrich/DIGITS-GAN,batra-mlp-lab/DIGITS,batra-mlp-lab/DIGITS,jmancewicz/DIGITS,brainstorm-ai/DIGITS,dongjoon-hyun/DIGITS,TimZaman/DIGITS,Deepomatic/DIGITS,Lucaszw/DIGITS,gheinrich/DIGITS-GAN,bygreencn/DIGITS,gheinrich/DIGITS-GAN,Lucaszw/DIGITS,Deepomatic/DIGITS,ethantang95/DIGITS-GAN,TimZaman/DIGITS,brainstorm-ai/DIGITS,ethantang95/DIGITS-GAN,bygreencn/DIGITS,bygreencn/DIGITS,ethantang95/DIGITS,batra-mlp-lab/DIGITS,dongjoon-hyun/DIGITS,Lucaszw/DIGITS,dongjoon-hyun/DIGITS,ethantang95/DIGITS,jmancewicz/DIGITS,brainstorm-ai/DIGITS,gheinrich/DIGITS-GAN,ethantang95/DIGITS-GAN,brainstorm-ai/DIGITS,bygreencn/DIGITS,Deepomatic/DIGITS,Deepomatic/DIGITS,ethantang95/DIGITS-GAN,TimZaman/DIGITS,jmancewicz/DIGITS,ethantang95/DIGITS,batra-mlp-lab/DIGITS,Lucaszw/DIGITS,jmancewicz/DIGITS,ethantang95/DIGITS,TimZaman/DIGITS,dongjoon-hyun/DIGITS