add GitHub Actions CI and CODEOWNERS file

.github/CODEOWNERS

@@ -0,0 +1 @@
+*	isaacs

.github/workflows/ci.yml

@@ -0,0 +1,48 @@
+name: Node CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [8.x, 10.x, 12.x, 14.x]
+        platform:
+        - os: ubuntu-latest
+          shell: bash
+        - os: macos-latest
+          shell: bash
+        - os: windows-latest
+          shell: bash
+        - os: windows-latest
+          shell: powershell
+
+    runs-on: ${{ matrix.platform.os }}
+    defaults:
+      run:
+        shell: ${{ matrix.platform.shell }}
+
+    steps:
+      # Checkout the npm/cli repo
+    - uses: actions/checkout@v2
+
+      # Installs the specific version of Node.js
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+
+      # Run the installer script
+    - name: Install dependencies
+      run: npm install
+
+      # Run the tests
+    - name: Run Tap tests
+      if: matrix.node-version != '8.x'
+      run: npm test
+
+      # Run the tests
+    - name: Run Tap tests
+      if: matrix.node-version == '8.x'
+      run: npm test -- --no-coverage

.gitignore

@@ -1,7 +1,7 @@
 # ignore most things, include some others
 /*
 /.*
-
+!.github
 !bin/
 !lib/
 !docs/