ci: move from travis to github actions

.github/workflows/tests.yml

@@ -0,0 +1,17 @@
+name: 'Test'
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request: {}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
+      - run: npm i
+      - run: npm test

README.md

@@ -1,5 +1,5 @@
 # sass-rhythm
-[![Build Status](https://travis-ci.org/swisnl/sass-rhythm.svg?branch=master)](https://travis-ci.org/swisnl/sass-rhythm)
+[![Build Status](https://img.shields.io/github/checks-status/swisnl/sass-rhythm/master?label=tests)](https://github.com/swisnl/sass-rhythm/actions/workflows/tests.yml)
 [![Latest Version on NPM](https://img.shields.io/npm/v/sass-rhythm.svg)](https://www.npmjs.com/package/sass-rhythm)
 [![Total Downloads](https://img.shields.io/npm/dw/sass-rhythm.svg)](https://www.npmjs.com/package/sass-rhythm)
 [![Software License](https://img.shields.io/npm/l/sass-rhythm.svg)](https://www.npmjs.com/package/sass-rhythm)