chore(travis): Use `node` base, instead of `cpp` (#1216)
chore(travis): Use `node` base, instead of `cpp` (#1216)

This changes the `.travis.yml` to use the `node_js` language
as a base instead of `cpp` to avoid installing & setting up node
manually.

Change-Type: patch
resin-io/resin-etcher,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/herostratus,resin-io/herostratus,resin-io/resin-etcher