Update badges in README

Author: eriwen

README.md

@@ -1,6 +1,12 @@
 error-stack-parser.js - Extract meaning from JS Errors
 ===============
-[![Build Status](https://travis-ci.org/stacktracejs/error-stack-parser.svg?branch=master)](https://travis-ci.org/stacktracejs/error-stack-parser) [![Coverage Status](https://img.shields.io/coveralls/stacktracejs/error-stack-parser.svg)](https://coveralls.io/r/stacktracejs/error-stack-parser) [![GitHub license](https://img.shields.io/github/license/stacktracejs/error-stack-parser.svg)](http://unlicense.org)
+[![Build Status](https://img.shields.io/travis/stacktracejs/error-stack-parser/master.svg?style=flat-square)](https://travis-ci.org/stacktracejs/error-stack-parser)
+[![Coverage Status](https://img.shields.io/coveralls/stacktracejs/error-stack-parser.svg?style=flat-square)](https://coveralls.io/r/stacktracejs/error-stack-parser?branch=master)
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+[![code of conduct](https://img.shields.io/badge/code%20of-conduct-lightgrey.svg?style=flat-square&colorB=ff69b4)](http://todogroup.org/opencodeofconduct/#stacktrace.js/me@eriwen.com)
 
 Simple, cross-browser [Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error) parser.
 This library parses and extracts function names, URLs, line numbers, and column numbers from the given Error's `stack` as