Handle loader query in JSON object format

It would be nice if this plugin supported the object-style configuration of loader queries. For example:

{
  "webpack": {
    "loaders": [{
      "loader": "babel-loader",
      "test": "**/*.js",
      "query": {
        "plugins": [
          "transform-object-rest-spread"
        ],
        "presets": [
          "es2015",
          "react"
        ]
      }
    }]
  }
}

If this is something you'd like to support, I could take a stab at the implementation.