Update the README badges (david, and travis)

It doesn’t look like AppVeyor supports “updating” the URL unless you set it all up again. It’s not tricky to set up, but it does require somebody from the org, because it needs to create a new webhook.

README.md

@@ -2,9 +2,9 @@
 
 [![Latest version](https://img.shields.io/npm/v/bugsnag-sourcemaps.svg)](https://www.npmjs.com/package/bugsnag-sourcemaps)
 [![Next version](https://img.shields.io/npm/v/bugsnag-sourcemaps/next.svg)](https://www.npmjs.com/package/bugsnag-sourcemaps)
-[![Dependencies](https://david-dm.org/jmshal/bugsnag-sourcemaps.svg)](https://david-dm.org/jmshal/bugsnag-sourcemaps)
+[![Dependencies](https://david-dm.org/bugsnag/bugsnag-sourcemaps.svg)](https://david-dm.org/bugsnag/bugsnag-sourcemaps)
 [![Monthly downloads](https://img.shields.io/npm/dm/bugsnag-sourcemaps.svg)](https://www.npmjs.com/package/bugsnag-sourcemaps)
-[![Build status](https://travis-ci.org/jmshal/bugsnag-sourcemaps.svg?branch=master)](https://travis-ci.org/jmshal/bugsnag-sourcemaps)
+[![Build status](https://travis-ci.org/bugsnag/bugsnag-sourcemaps.svg?branch=master)](https://travis-ci.org/bugsnag/bugsnag-sourcemaps)
 [![Build status](https://ci.appveyor.com/api/projects/status/lfm5kxi7ew6i1780?svg=true)](https://ci.appveyor.com/project/jmshal/bugsnag-sourcemaps)
 
 A Node.js module to programmatically upload your sourcemap files to Bugsnag.