Bump certifi from 2017.4.17 to 2017.11.5 in /backend/uclapi
Bump certifi from 2017.4.17 to 2017.11.5 in /backend/uclapi

Bumps [certifi](http://certifi.io/) from 2017.4.17 to 2017.11.5.
uclapi/uclapi,uclapi/uclapi,uclapi/uclapi,uclapi/uclapi