Merge pull request #1090 from asciimoo/requirement_upgrade

Dependencies upgrade

requirements.txt

-certifi==2017.7.27.1
+certifi==2017.11.5
 flask==0.12.2
 flask-babel==0.11.2
-lxml==3.8.0
+lxml==4.1.1
 idna==2.5
 pygments==2.1.3
-pyopenssl==17.2.0
+pyopenssl==17.4.0
 python-dateutil==2.6.1
 pyyaml==3.12
 requests[socks]==2.18.4