doc: link badge to npm page

Author: kt3k

README.md

@@ -1,6 +1,6 @@
 # Logger for Redux
-[![npm](https://img.shields.io/npm/v/redux-logger.svg?maxAge=2592000?style=plastic)]()
-[![npm](https://img.shields.io/npm/dm/redux-logger.svg?maxAge=2592000?style=plastic)]()
+[![npm](https://img.shields.io/npm/v/redux-logger.svg?maxAge=2592000?style=plastic)](https://www.npmjs.com/package/redux-logger)
+[![npm](https://img.shields.io/npm/dm/redux-logger.svg?maxAge=2592000?style=plastic)](https://www.npmjs.com/package/redux-logger)
 [![Build Status](https://travis-ci.org/evgenyrodionov/redux-logger.svg?branch=master)](https://travis-ci.org/evgenyrodionov/redux-logger)
 [![dependencies Status](https://david-dm.org/evgenyrodionov/redux-logger/status.svg)](https://david-dm.org/evgenyrodionov/redux-logger)