Removes outdated status badges from README (GoogleCloudPlatform#967)

Author: bshaffer

README.md

@@ -2,10 +2,6 @@
 
 A collection of samples that demonstrate how to call Google Cloud services from PHP.
 
-[![Travis Build Status](https://travis-ci.org/GoogleCloudPlatform/php-docs-samples.svg)](https://travis-ci.org/GoogleCloudPlatform/php-docs-samples)
-![Jenkins Build Status](https://storage.googleapis.com/cloud-samples-tests-php/jenkins-e2e-status.svg)
-[![Coverage Status](https://coveralls.io/repos/github/GoogleCloudPlatform/php-docs-samples/badge.svg?branch=master)](https://coveralls.io/github/GoogleCloudPlatform/php-docs-samples?branch=master)
-
 See our other [Google Cloud Platform github
 repos](https://github.com/GoogleCloudPlatform) for sample applications and
 scaffolding for other frameworks and use cases.