Issue with Travis CI

[vpodk]

Unable to build this project with Travis CI.

1. The latest "node_js": "node" is not compatible with "fibers" module.
   See log for build #682.

2. Using "node_js": "10.11.0" (from the last passed build #674) throws an error "Variable IdleDeadline declared more than once" because npm test found it again in the "/lib/externs/request-idle-callback.js" file.
   See log for build #681.

Can you please take a look to my pull request #240?