Fix build error

Author: WhatAKitty

package.json

@@ -31,8 +31,10 @@
   },
   "homepage": "https://github.com/WhatAKitty/react-native-fetch-mock#readme",
   "devDependencies": {
-    "babel": "^6.23.0",
+    "babel-cli": "^6.24.1",
+    "babel-core": "^6.24.1",
     "babel-eslint": "^7.2.2",
+    "babel-polyfill": "^6.23.0",
     "babel-preset-react-native": "^1.9.1",
     "eslint": "^3.19.0",
     "expect.js": "^0.3.1",

test/index.test.js

@@ -2,7 +2,7 @@ import 'babel-polyfill';
 import expect from 'expect.js';
 import FetchMock from '../src';
 
-const fetch = new FetchMock('../__mocks__').fetch;
+const fetch = new FetchMock(require('../__mocks__')).fetch;
 describe('test fetch mock', () => {
   it('fetch /api/users data', async () => {
     const { data } = await fetch('/api/users');