put package requirements into requirements.txt

[DillionApple]

Install those packages one by one is not convenient. I suggest to put all required packages into requirements.txt like below, so users can install all packages using one command: pip install -r requirements.txt

beautifulsoup4==4.6.3
bs4==0.0.1
certifi==2018.8.24
chardet==3.0.4
configobj==5.0.6
cssselect==1.0.3
goose3==3.1.5
idna==2.7
jieba==0.39
lxml==4.2.5
nltk==3.3
Pillow==5.2.0
python-dateutil==2.7.3
requests==2.19.1
six==1.11.0
urllib3==1.23

[LuChang-CS]

Right