Later Versions of cross-fetch-1.1.1.tgz and node-fetch-1.7.3.tgz have not not been updated in CmisJS 

Hello team,

We would like to upgrade cross-fetch-1.1.1.tgz and node-fetch-1.7.3.tgz to latest version as part of security vulnerability fix,

could you update your library, so that we can pull the latest CmisJS.

Regards,
Navin