Update badges

Author: nason

README.md

@@ -1,6 +1,6 @@
 redux-api-middleware
 ====================
-[![npm version](https://badge.fury.io/js/redux-api-middleware.svg)](https://npm.im/redux-api-middleware) [![npm downloads](https://img.shields.io/npm/dm/redux-api-middleware.svg)](https://npm.im/redux-api-middleware) [![Build Status](https://travis-ci.org/agraboso/redux-api-middleware.svg?branch=next)](https://travis-ci.org/agraboso/redux-api-middleware) [![Coverage Status](https://coveralls.io/repos/agraboso/redux-api-middleware/badge.svg?branch=next&service=github)](https://coveralls.io/github/agraboso/redux-api-middleware?branch=next)
+[![npm version](https://badge.fury.io/js/redux-api-middleware.svg)](https://npm.im/redux-api-middleware) [![npm downloads](https://img.shields.io/npm/dm/redux-api-middleware.svg)](https://npm.im/redux-api-middleware) [![Build Status](https://travis-ci.org/agraboso/redux-api-middleware.svg?branch=master)](https://travis-ci.org/agraboso/redux-api-middleware) [![Coverage Status](https://coveralls.io/repos/agraboso/redux-api-middleware/badge.svg?branch=master&service=github)](https://coveralls.io/github/agraboso/redux-api-middleware?branch=master) [![Package Size](https://badgen.net/bundlephobia/minzip/redux-api-middleware)](https://bundlephobia.com/result?p=redux-api-middleware)
 
 [Redux middleware](https://redux.js.org/docs/advanced/Middleware.html) for calling an API.