Fixed proptypes issue on newer versions of React Native

Author: tukantje

main.js

@@ -1,4 +1,5 @@
-import React, { Component, PropTypes } from 'react';
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
 import {
   StyleSheet,
   Text,

package.json

@@ -10,6 +10,7 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "dependencies": {
+    "prop-types": "^15.6.0",
     "react-native-circular-progress": "0.0.8",
     "react-native-vector-icons": "3.0.0"
   },