Switch to GitHub Actions (#1974)

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+          cache: 'maven'
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify

.travis.yml

@@ -1,20 +0,0 @@
-language: java
-
-jdk:
-  - openjdk11
-
-install: mvn -f gson install -DskipTests=true
-script: mvn -f gson test
-
-branches:
-  except:
-    - gh-pages
-
-notifications:
-  email: false
-
-sudo: false
-
-cache:
-  directories:
-    - $HOME/.m2

README.md

@@ -32,7 +32,7 @@ Maven:
 
 [Gson jar downloads](https://maven-badges.herokuapp.com/maven-central/com.google.code.gson/gson) are available from Maven Central.
 
-[![Build Status](https://travis-ci.org/google/gson.svg?branch=master)](https://travis-ci.org/google/gson)
+![Build Status](https://github.com/google/gson/actions/workflows/build.yml/badge.svg)
 
 ### Documentation
   * [API Javadoc](https://www.javadoc.io/doc/com.google.code.gson/gson): Documentation for the current release