Update to use prop-types module in components.

src/components/layers/JSONEditor.jsx

@@ -1,4 +1,5 @@
 import React from 'react'
+import PropTypes from 'prop-types'
 
 import CodeMirror from 'react-codemirror'
 import InputBlock from '../inputs/InputBlock'
@@ -18,8 +19,8 @@ import '../../vendor/codemirror/addon/lint/json-lint'
 
 class JSONEditor extends React.Component {
   static propTypes = {
-    layer: React.PropTypes.object.isRequired,
-    onChange: React.PropTypes.func,
+    layer: PropTypes.object.isRequired,
+    onChange: PropTypes.func,
   }
 
   constructor(props) {