Adds GitHub Actions CI, removes .travis.yml

Author: mattxwang

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+
+    runs-on: ${{ matrix.os }}
+
+    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