Update Travis CI build status with correct branch

didactic-umbrella · web-flow · commit 967291393e2d · 2018-03-01T19:30:14.000+02:00
Current Travis CI build status image link leads to the obsolete develop branch. Updated to 2.3-develop.
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/magento/magento2.svg?branch=develop)](https://travis-ci.org/magento/magento2)
+[![Build Status](https://travis-ci.org/magento/magento2.svg?branch=2.3-develop)](https://travis-ci.org/magento/magento2)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/magento/magento2?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Crowdin](https://d322cqt584bo4o.cloudfront.net/magento-2/localized.png)](https://crowdin.com/project/magento-2)
 <h2>Welcome</h2>

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-[![Build Status](https://travis-ci.org/magento/magento2.svg?branch=develop)](https://travis-ci.org/magento/magento2)`
	`1`	`+[![Build Status](https://travis-ci.org/magento/magento2.svg?branch=2.3-develop)](https://travis-ci.org/magento/magento2)`
`2`	`2`	`[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/magento/magento2?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)`
`3`	`3`	`[![Crowdin](https://d322cqt584bo4o.cloudfront.net/magento-2/localized.png)](https://crowdin.com/project/magento-2)`
`4`	`4`	`<h2>Welcome</h2>`