Update README with beta badge and installation instructions

README.md

@@ -1,7 +1,7 @@
 # country-emoji
 
 [![npm_svg]][npm_url]
-[![npm_alpha_svg]][npm_url]
+[![npm_beta_svg]][npm_url]
 [![dl_url]][npm_url]
 [![coveralls_svg]][coveralls_url]
 [![codecov_svg]][codecov_url]
@@ -10,7 +10,7 @@
 
 
 [npm_svg]: https://img.shields.io/npm/v/country-emoji
-[npm_alpha_svg]: https://img.shields.io/npm/v/country-emoji/alpha
+[npm_beta_svg]: https://img.shields.io/npm/v/country-emoji/beta
 [npm_url]: https://www.npmjs.com/package/country-emoji
 
 [dl_url]: https://img.shields.io/npm/dw/country-emoji
@@ -34,14 +34,14 @@ Converts between country names, ISO 3166-1 codes and flag emojis. **Has zero dep
 ```
 $ npm install --save country-emoji
 # or
-$ npm install --save country-emoji@alpha
+$ npm install --save country-emoji@beta
 ```
 
 ## Usage
 
 ```js
 const {flag, code, name, countries} = require('country-emoji');
-// or
+// or (beta)
 import {flag, code, name, countries} from 'country-emoji';
 
 flag('CL')