Update requirements.txt (#774)
Update requirements.txt (#774)

* Update requirements.txt

tornado 5.x is not suitable for for pyspider

* Update requirements.txt

wangjun/pyspider,wangjun/pyspider,luoq/pyspider,luoq/pyspider,luoq/pyspider,binux/pyspider,binux/pyspider,binux/pyspider,wangjun/pyspider