docs(README.md): fix badges

Author: jedwards1211

README.md

@@ -1,9 +1,10 @@
 # @jcoreio/require-env
 
-[![Build Status](https://travis-ci.org/jcoreio/require-env.svg?branch=master)](https://travis-ci.org/jcoreio/require-env)
+[![CircleCI](https://circleci.com/gh/jcoreio/require-env.svg?style=svg)](https://circleci.com/gh/jcoreio/require-env)
 [![Coverage Status](https://codecov.io/gh/jcoreio/require-env/branch/master/graph/badge.svg)](https://codecov.io/gh/jcoreio/require-env)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
+[![npm version](https://badge.fury.io/js/%40jcoreio%2Frequire-env.svg)](https://badge.fury.io/js/%40jcoreio%2Frequire-env)
 
 A simple function that returns the value of an environment variable, but **throws if it's not a non-empty string**.
 Logs the entire environment to `console.error` to aid debugging.