Use prop-types lib instead of deprecated React.PropTypes (#100)

Author: rsolomon

package.json

@@ -45,5 +45,8 @@
     "react": "^15.3.2",
     "react-dom": "^15.3.2",
     "react-tap-event-plugin": "^1.0.0 || ^2.0.0"
+  },
+  "dependencies": {
+    "prop-types": "^15.5.7"
   }
 }

src/ChipInput.js

@@ -2,7 +2,8 @@
  * Notice: Some code was adapted from Material-UI's text field.
  *         Copyright (c) 2014 Call-Em-All (https://github.com/callemall/material-ui)
  */
-import React, { PropTypes } from 'react'
+import React from 'react'
+import PropTypes from 'prop-types'
 import TextFieldUnderline from 'material-ui/TextField/TextFieldUnderline'
 import TextFieldHint from 'material-ui/TextField/TextFieldHint'
 import TextFieldLabel from 'material-ui/TextField/TextFieldLabel'