fix #33: replace travis ci with github actions

.github/workflows/nudged-ci.yml

@@ -0,0 +1,21 @@
+name: Nudged CI
+run-name: nudged test run by ${{ github.actor }}
+
+on: [push]
+
+jobs:
+  nudged-node-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10, 12, 14, 18, 20, 22]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test

README.md

@@ -1,8 +1,9 @@
 # nudged
 
 [![NPM Version](https://img.shields.io/npm/v/nudged.svg)](https://www.npmjs.com/package/nudged)
-[![Build Status](https://img.shields.io/travis/com/axelpale/nudged)](https://travis-ci.com/github/axelpale/nudged)
 ![Dependency status](https://img.shields.io/badge/dependencies-none-lightgrey)
+[![License](https://img.shields.io/npm/l/nudged)](#license)
+[![GitHub Actions workflow status](https://img.shields.io/github/actions/workflow/status/axelpale/nudged/nudged-ci.yml)](https://github.com/axelpale/nudged/actions/workflows/nudged-ci.yml)
 
 ![Nudged logo](doc/nudged-logo-2021-512.png)