Added Travis CI badge to README.md

README.md

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-# Earth Enterprise [![Chat on Slack](https://img.shields.io/badge/chat-on%20slack-ff69b4.svg)](http://slack.opengee.org)
+# Earth Enterprise [![Chat on Slack](https://img.shields.io/badge/chat-on%20slack-ff69b4.svg)](http://slack.opengee.org) [![build](https://travis-ci.org/google/earthenterprise.svg?branch=master)](https://travis-ci.org/google/earthenterprise/builds)
 
 Earth Enterprise is the open source release of Google Earth Enterprise, a geospatial application which provides the ability to build and host custom 3D globes and 2D maps.  Earth Enterprise does not provide a private version of Google imagery that's currently available in Google Maps or Earth.
 
@@ -34,3 +34,4 @@ Refer to the [BUILD.md file](./earth_enterprise/BUILD.md) for instructions on bu
 
 ### Installation
 Refer to the [Install Instructions](https://github.com/google/earthenterprise/wiki/Install-Fusion-or-Earth-Server) for instructions on installing Fusion or Earth Server.  Please note that you must have a successful build of the source before proceeding with the install.
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