Added Travis badge to Readme

Author: Marcel Schnelle

README.md

@@ -1,4 +1,7 @@
 # android-junit5
+
+[![Travis Build Status](https://travis-ci.org/aurae/android-junit5.svg?branch=master)][travisci]
+
 A Gradle plugin that allows for the execution of [JUnit 5][junit5gh] unit tests in Android environments.
 
 ## Setup
@@ -51,4 +54,5 @@ junitPlatform {
 ```
 
  [junit5gh]: https://github.com/junit-team/junit5
- [junit5ug]: http://junit.org/junit5/docs/current/user-guide/
+ [junit5ug]: http://junit.org/junit5/docs/current/user-guide
+ [travisci]: https://travis-ci.org/aurae/android-junit5