Merge pull request #184 from scala/fix-build-badge

Update build status badge

README.md

@@ -1,6 +1,6 @@
 # scala-swing
 
-[<img src="https://img.shields.io/travis/scala/scala-swing/java7.svg"/>](https://travis-ci.org/scala/scala-swing)
+[![build](https://github.com/scala/scala-swing/workflows/test/badge.svg)](https://github.com/scala/scala-swing/actions/workflows/ci.yml?query=branch%3Awork)
 [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-swing_2.11.svg?label=latest%20release%20for%202.11"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-swing_2.11)
 [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-swing_2.12.svg?label=latest%20release%20for%202.12"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-swing_2.12)
 [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-swing_2.13.svg?label=latest%20release%20for%202.13"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-swing_2.13)