deprecated `request` dependency

[DercilioFontes]

I'm getting this warning:

npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142

From my investigation, it is coming from node-slack

    "node-slack": {
      "version": "0.0.7",
      "resolved": "https://registry.npmjs.org/node-slack/-/node-slack-0.0.7.tgz",
      "integrity": "sha512-LsjUmymJcwF7P2Z3wImZRYIZvh068aQNYK6/FW+24fred4+hWPHyc6L9f7nQUoA6myt6NPFDBPXSqe493+cXqQ==",
      "requires": {
        "deferred": "0.7.1",
        "request": "~2.x"
      }
    },

Link: request/request#3142