Upgrade request dependency, fixes #608 (#612)
Upgrade request dependency, fixes #608 (#612)

`tough-cookie`, a transitive dependency of this module
via `request`, has a security vulnerability:

https://nodesecurity.io/advisories/130

`request` has already upgraded its dependency to fix
the issue, so it's just a matter of bumping the version
depended on here.
sqrrrl/google-api-nodejs-client,chitsuhein/google-api-nodejs-client,stems/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,googleapis/google-api-nodejs-client,googleapis/google-api-nodejs-client,stems/google-api-nodejs-client,stems/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,stems/google-api-nodejs-client,stems/google-api-nodejs-client,googleapis/google-api-nodejs-client