Remove Travis, add GitHub action.

Author: joehni

.github/workflows/maven.yml

@@ -0,0 +1,26 @@
+# This workflow will build a Java project with Maven
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-java@v3
+    - name: Set up JDK 17
+      with:
+        distribution: temurin
+        java-version: 17
+    - name: Build with Maven
+      run: mvn -V -B package site
+

.travis.yml

@@ -1,4 +1,4 @@
-master: [![Build Status](https://travis-ci.org/x-stream/xstream.svg?branch=master)](https://travis-ci.org/x-stream/xstream) [![Coverage Status](https://coveralls.io/repos/github/x-stream/xstream/badge.svg?branch=master)](https://coveralls.io/github/x-stream/xstream?branch=master)  
+master: [![CI with Maven](https://github.com/x-stream/xstream/workflows/CI%20with%20Maven/badge.svg)](https://github.com/x-stream/xstream/actions?query=workflow%3A%22CI+with+Maven%22) [![Coverage Status](https://coveralls.io/repos/github/x-stream/xstream/badge.svg?branch=master)](https://coveralls.io/github/x-stream/xstream?branch=master)  
 v-1.4.x: [![Build Status](https://travis-ci.org/x-stream/xstream.svg?branch=v-1.4.x)](https://travis-ci.org/x-stream/xstream) [![Coverage Status](https://coveralls.io/repos/github/x-stream/xstream/badge.svg?branch=v-1.4.x)](https://coveralls.io/github/x-stream/xstream?branch=v-1.4.x)
 
 - - - -
@@ -18,6 +18,7 @@ includes:
 * [JavaDoc](http://x-stream.github.io/javadoc/index.html)
 * [Change History](http://x-stream.github.io/changes.html)
 * [Frequently Asked Questions](http://x-stream.github.io/faq.html)
+* [Security](http://x-stream.github.io/security.html)
 
 ## Source
 The complete source for XStream is bundled in the -src archive.  This includes:

README.md

@@ -21,6 +21,7 @@ includes:
  * JavaDoc
  * Change History
  * Frequently Asked Questions
+ * Security
 
 --[ Source ]-------------------------------------------------