Merge pull request #2854 from marutosi/finn/release/4.0/README.md/travis

[release/4.0] fix README.md travis branch

README.md

@@ -1,6 +1,6 @@
 # OpenProject
 
-[<img src="https://travis-ci.org/opf/openproject.svg?branch=dev" alt="Build Status" />](https://travis-ci.org/opf/openproject)
+[<img src="https://travis-ci.org/opf/openproject.svg?branch=release/4.0" alt="Build Status" />](https://travis-ci.org/opf/openproject)
 [<img src="https://gemnasium.com/opf/openproject.png" alt="Dependency Status" />](https://gemnasium.com/opf/openproject)
 [![Code Climate](https://codeclimate.com/github/opf/openproject/badges/gpa.svg)](https://codeclimate.com/github/opf/openproject)
 [![Inline docs](http://inch-ci.org/github/opf/openproject.png?branch=release/4.0)](http://inch-ci.org/github/opf/openproject)