`no-unused-prop-types` and `getDerivedStateFromProps`

no-unused-prop-types should take into account usages from new React lifecycles

[jinliming2]

Waiting for this.

[mrbinky3000]

eslintrc file in the project root foler

{
    // this left intentionally blank
}

eslintrc file in the folder that contains our react app

{
  "extends": [
    "airbnb"
  ],
  "settings": {
    "react": {
      "pragma": "React",
      "version": "16.3"
    },
  },
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "node": true
  },
  "plugins": [
    "react",
    "jsx-a11y"
  ],
  "rules" {
     ... a few rule tweaks, none dealing with unused props.
  }
  "globals": {
    "expect": true,
    "PRODUCTION": true,
    "VERSION": true,
  }
}