chore(requirements): update Requests to 2.11.1 (#990)

http://docs.python-requests.org/en/latest/community/updates/#id1

Author: helgi

rootfs/requirements.txt

@@ -13,7 +13,7 @@ ndg-httpsclient==0.4.2
 psycopg2==2.6.2
 pyOpenSSL==16.0.0
 pytz==2016.6.1
-requests==2.11.0
+requests==2.11.1
 requests-toolbelt==0.7.0
 simpleflock==0.0.3
 jsonschema==2.5.1