Use prop-types package instead of React.PropTypes

[ssilve1989]

In response to warnings appearing when using React 15.5+

[audiolion]

this should be under devDependencies

[ssilve1989]

@audiolion
Actually its suggested to place it in dependencies.

A quote from the library page.

For libraries, we also recommend leaving it in dependencies:

  "dependencies": {
    "prop-types": "^15.5.0" 
  },
  "peerDependencies": {
    "react": "^15.5.0" 
  }

https://www.npmjs.com/package/prop-types

[audiolion]

Interesting, well ya got me 👍

[wwayne]

Yeah thanks @ssilve1989 and @audiolion , merging