build: switch to gh actions (#79)

* build: switch to gh actions

* chore: rm appveyor

Author: aladdin-add

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - '17'
+          - '16'
+          - '14'
+          - '12'
+        os:
+          - ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+      - run: npm install
+      - run: npm run lint
+
+  eslint6:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+    - run: npm install
+    - run: npm install --save-dev eslint@6
+    - run: npm test
+      
+  eslint7:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+    - run: npm install
+    - run: npm install --save-dev eslint@7
+    - run: npm test