chore(build): Update dependencies

chore(build): Update dependencies

* Update README with codecov badge
* 🔥 Removes webpack
Related to
#691

build(Travis): update file-type dep

Author: germanattanasio

README.md

@@ -1,6 +1,7 @@
 # Watson APIs Node.js SDK
 
 [![Build Status](https://secure.travis-ci.org/watson-developer-cloud/node-sdk.svg)](http://travis-ci.org/watson-developer-cloud/node-sdk)
+[![codecov](https://codecov.io/gh/watson-developer-cloud/node-sdk/branch/master/graph/badge.svg)](https://codecov.io/gh/watson-developer-cloud/node-sdk)
 [![Slack](https://wdc-slack-inviter.mybluemix.net/badge.svg)](https://wdc-slack-inviter.mybluemix.net)
 [![npm-version](https://img.shields.io/npm/v/watson-developer-cloud.svg)](https://www.npmjs.com/package/watson-developer-cloud)
 [![npm-downloads](https://img.shields.io/npm/dm/watson-developer-cloud.svg)](https://www.npmjs.com/package/watson-developer-cloud)