fixed the security vulnerability

Author: WHYjun

requirements.txt

@@ -2,7 +2,9 @@ asn1crypto==0.24.0
 attrs==17.4.0
 Automat==0.6.0
 beautifulsoup4==4.6.0
+certifi==2018.10.15
 cffi==1.11.5
+chardet==3.0.4
 constantly==15.1.0
 cryptography==2.1.4
 cssselect==1.0.3
@@ -19,10 +21,12 @@ PyDispatcher==2.0.5
 pymongo==3.6.1
 pyOpenSSL==17.5.0
 queuelib==1.4.2
+requests==2.20.0
 Scrapy==1.5.0
 service-identity==17.0.0
 six==1.11.0
 Twisted==17.9.0
+urllib3==1.24.1
 w3lib==1.19.0
 webencodings==0.5.1
 zope.interface==4.4.3