Replace Travis CI with GitHub Actions for running tests

.github/workflows/tests.yml

@@ -0,0 +1,19 @@
+name: Tests
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - run: npm ci
+      - run: npm test

README.md

@@ -2,31 +2,27 @@
 
 Validates Swedish personal identity numbers
 
-[![Build Status][travis-image]][travis-url]
+![Tests][tests-badge]
 [![NPM version][npm-image]][npm-url]
 
-
 ## Install
 
 ```
 $ npm install --save swedish-personal-identity-number-validator
 ```
 
-
 ## Usage
 
 ```js
-import { isValid } from 'swedish-personal-identity-number-validator';
+import { isValid } from "swedish-personal-identity-number-validator";
 
-isValid('foobar') // => false
+isValid("foobar"); // => false
 ```
 
-
 ## License
 
 MIT © [Jonathan Svenheden](https://github.com/svenheden)
 
 [npm-url]: https://npmjs.org/package/swedish-personal-identity-number-validator
 [npm-image]: https://badge.fury.io/js/swedish-personal-identity-number-validator.svg
-[travis-image]: https://travis-ci.org/svenheden/swedish-personal-identity-number-validator.svg
-[travis-url]: https://travis-ci.org/svenheden/swedish-personal-identity-number-validator
+[tests-badge]: https://github.com/svenheden/swedish-personal-identity-number-validator/workflows/Tests/badge.svg