We should specify the node version we use

[ghost]

Right now it is

  "engines": {
    "node": ">=5.11.0"
  },

But I think we should specify the specific version, also the npm version

"engines": {
    "node": "x.x.x",
    "npm": "x.x.x"
  },

What do you guys think? Also, what specific version would you like to set?

[rkmax]

I think more important than the node or npm version are the dependencies, normally they get updated quickly, I think with define a minimum version (I think 4 it's enough) and from that we can just keeping dependencies updated