Updating "request" dependency

There was a security update to the **qs** module in **request@2.40.0**, see:
- https://nodesecurity.io/advisories/qs_dos_extended_event_loop_blocking
- https://nodesecurity.io/advisories/qs_dos_memory_exhaustion
Merge pull request #18 from pdehaan/patch-1

Updating "request" dependency.