ci: drop Node.js 10 and add 16

Author: susisu

.github/workflows/ci.yml

@@ -4,24 +4,24 @@ on:
   pull_request:
   release:
     types:
-    - created
+      - created
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         node-version:
-        - 10.x
-        - 12.x
-        - 14.x
+          - '12'
+          - '14'
+          - '16'
     steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-    - name: Set up Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: yarn install --frozen-lockfile
-    - run: yarn lint
-    - run: yarn test
-    - run: yarn build
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: yarn install --frozen-lockfile
+      - run: yarn lint
+      - run: yarn test
+      - run: yarn build