Remove unused imports in test

Author: ryanhefner

src/index.test.js

@@ -1,7 +1,4 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
-import ReactTestUtils from 'react-dom/test-utils';
-import renderer from 'react-test-renderer';
 import Enzyme, { mount, shallow } from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 import throttle from 'lodash.throttle';