Use GitHub Actions for CI

.github/workflows/ci-node-10.yml

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+name: CI on Node 10
+
+on: [push]
+
+jobs:
+  test:
+    name: Test on Node 10
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: docker://node:10-alpine
+      name: Install
+      with:
+        entrypoint: yarn
+        args: install --pure-lockfile --audit
+    - uses: docker://node:10-alpine
+      name: Lint
+      with:
+        entrypoint: yarn
+        args: lint
+    - uses: docker://node:10-alpine
+      name: Test
+      with:
+        entrypoint: yarn
+        args: test

.github/workflows/ci-node-12.yml

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+name: CI on Node 12
+
+on: [push]
+
+jobs:
+  test:
+    name: Test on Node 12
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: docker://node:12-alpine
+      name: Install
+      with:
+        entrypoint: yarn
+        args: install --pure-lockfile --audit
+    - uses: docker://node:12-alpine
+      name: Lint
+      with:
+        entrypoint: yarn
+        args: lint
+    - uses: docker://node:12-alpine
+      name: Test
+      with:
+        entrypoint: yarn
+        args: test

.github/workflows/ci-node-8.yml

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+name: CI on Node 8
+
+on: [push]
+
+jobs:
+  test:
+    name: Test on Node 8
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: docker://node:8-alpine
+      name: Install
+      with:
+        entrypoint: yarn
+        args: install --pure-lockfile --audit
+    - uses: docker://node:8-alpine
+      name: Lint
+      with:
+        entrypoint: yarn
+        args: lint
+    - uses: docker://node:8-alpine
+      name: Test
+      with:
+        entrypoint: yarn
+        args: test