Replace travis with github actions

.github/workflows/ci.yaml

@@ -0,0 +1,55 @@
+name: 'GitHub CI'
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test-node:
+    name: Test on Node.js v${{ matrix.node-version }} and jest v${{ matrix.jest-version }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [12.x, 14.x, 16.x]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: yarn
+      - run: yarn install
+      - run: yarn test:coverage
+
+  test-os:
+    name: Test on ${{ matrix.os }} using Node.js LTS
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16.x
+          cache: yarn
+      - run: yarn install
+      - run: yarn test:coverage
+
+  lint:
+    name: Run ESLint 
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16.x
+          cache: yarn
+      - run: yarn install
+      - run: yarn lint