deps: upgrade to npm 2.14.17
Another week, another npm!
Notable changes:
- Doc updates
- npm/npm@3842317 npm/npm#11290 Suppress warnings about pre-release node versions. This should get node's CI passing on non-Windows platforms without needing to modify the node version to get rid of the pre-release suffix. (@iarna)
r @iarna r @Fishrock123 r @jasnell