chore: rename files which use JSX syntax to have the .jsx extension

packages/template-redux/src/counter/spec/index.spec.js → packages/template-redux/src/counter/spec/index.spec.jsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import * as React from 'react';
 import { Provider } from 'react-redux';
 import renderer from 'react-test-renderer';
 import CounterContainer, { mapStateToProps } from '../';