Fix build status badges

Author: aherbert

gdsc-core-ij/README.md

@@ -2,7 +2,7 @@ GDSC Core ImageJ
 ================
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
-[![Build Status](https://travis-ci.com/aherbert/gdsc-core.svg?branch=master)](https://travis-ci.com/aherbert/gdsc-core)
+[![Build Status](https://github.com/aherbert/gdsc-core/actions/workflows/build.yml/badge.svg)](https://github.com/aherbert/gdsc-core/actions/workflows/build.yml)
 [![Coverage Status](https://coveralls.io/repos/github/aherbert/gdsc-core/badge.svg?branch=master)](https://coveralls.io/github/aherbert/gdsc-core?branch=master)
 [![Maven Central](https://img.shields.io/maven-central/v/uk.ac.sussex.gdsc/gdsc-core-ij)](https://search.maven.org/artifact/uk.ac.sussex.gdsc/gdsc-core-ij/)
 [![Javadocs](https://javadoc.io/badge2/uk.ac.sussex.gdsc/gdsc-core-ij/javadoc.svg)](https://javadoc.io/doc/uk.ac.sussex.gdsc/gdsc-core-ij)

gdsc-core/README.md

@@ -2,7 +2,7 @@ GDSC Core
 =========
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
-[![Build Status](https://travis-ci.com/aherbert/gdsc-core.svg?branch=master)](https://travis-ci.com/aherbert/gdsc-core)
+[![Build Status](https://github.com/aherbert/gdsc-core/actions/workflows/build.yml/badge.svg)](https://github.com/aherbert/gdsc-core/actions/workflows/build.yml)
 [![Coverage Status](https://coveralls.io/repos/github/aherbert/gdsc-core/badge.svg?branch=master)](https://coveralls.io/github/aherbert/gdsc-core?branch=master)
 [![Maven Central](https://img.shields.io/maven-central/v/uk.ac.sussex.gdsc/gdsc-core)](https://search.maven.org/artifact/uk.ac.sussex.gdsc/gdsc-core/)
 [![Javadocs](https://javadoc.io/badge2/uk.ac.sussex.gdsc/gdsc-core/javadoc.svg)](https://javadoc.io/doc/uk.ac.sussex.gdsc/gdsc-core)