BUG: saving javascript filetype throws an error (PR submitted)

[rayjanwilson]

when configuring the plugin for outputting a javascript formatted file, the following error is thrown: ERROR: amplify-plugin: Cannot load resources: nativeConfig is not defined

Pull Request incoming

• A reproducible test case or series of steps

  amplify:
  - filename: ./aws-exports.js
    type: javascript
    appClient: WebUserPoolClient

• The version of our code being used
  • v0.1.0
• Any modifications you've made relevant to the bug
  • direct install from npm
• Anything unusual about your environment or deployment
  • os x: v10.13.6
  • serverless: v1.32.0
  • node.js: v10.12.0