Merge pull request #21 from TimonVS/chore/ci

Set-up CI using GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js 12
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12
+    - name: Install dependencies
+      run: npm ci
+      env:
+        CI: true
+    - name: Run tests
+      run: npm test
+      env:
+        CI: true