Switch over continuous integration to GitHub workflows.

.github/workflows/test.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  push:
+    paths-ignore: ['**.md', '**.adoc']
+  pull_request:
+    paths-ignore: ['**.md', '**.adoc']
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    continue-on-error: ${{matrix.emacs_version == 'snapshot'}}
+
+    strategy:
+      matrix:
+        emacs_version: ['24.4', '24.5',
+                        '25.1', '25.2', '25.3',
+                        '26.1', '26.2', '26.3',
+                        '27.1',
+                        'snapshot']
+
+    steps:
+    - name: Set up Emacs
+      uses: purcell/setup-emacs@master
+      with:
+        version: ${{matrix.emacs_version}}
+
+    - name: Install Eldev
+      run: curl -fsSL https://raw.github.com/doublep/eldev/master/webinstall/github-eldev | sh
+
+    - name: Check out the source code
+      uses: actions/checkout@v2
+
+    - name: Test the project
+      run: |
+        eldev -p -dtT -C test --expect 15
+        eldev -dtT -C compile --set all --warnings-as-errors

README.adoc

@@ -9,7 +9,7 @@
 
 image:https://img.shields.io/badge/license-GPL_3-green.svg[License: GPL 3, link=http://www.gnu.org/licenses/gpl-3.0.txt]
 image:http://stable.melpa.org/packages/flycheck-eldev-badge.svg[Melpa Stable, link=http://stable.melpa.org/#/flycheck-eldev]
-image:https://api.travis-ci.org/flycheck/flycheck-eldev.svg[Build status, link=https://travis-ci.org/flycheck/flycheck-eldev]
+image:https://github.com/flycheck/flycheck-eldev/workflows/CI/badge.svg[Build status, link=https://github.com/flycheck/flycheck-eldev/actions?query=workflow%3ACI]
 
 Make {uri-flycheck}[Flycheck] use proper dependencies in
 {uri-eldev}[Eldev] projects.