docs(readme): add badges

Author: Sergei Orlov

README.md

@@ -1,5 +1,13 @@
 # @raini/switch
 
+[![Build Status](https://travis-ci.org/Raini-js/switch.svg?branch=master)](https://travis-ci.org/Raini-js/switch)
+[![codecov](https://codecov.io/gh/raini/switch/branch/master/graph/badge.svg)](https://codecov.io/gh/raini/switch)
+[![npm](https://img.shields.io/npm/dt/@raini/switch.svg)](https://www.npmjs.com/package/@raini/switch)
+[![npm](https://img.shields.io/npm/v/@raini/switch.svg)](https://www.npmjs.com/package/@raini/switch)
+[![licence: MIT](https://img.shields.io/npm/l/@raini/switch.svg)](https://github.com/raini/switch)
+[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
+[![versioning: semantics](https://img.shields.io/badge/versioning-semantics-912e5c.svg)](https://github.com/priestine/semantics)
+
 ## Installation
 
 ```bash