build: use node v16(lts) to run the tests (#232)

Author: aladdin-add

.github/workflows/main.yml

@@ -31,6 +31,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
+        with:
+          node-version: "16.x"
       - run: npm install
       - run: npm run lint
 
@@ -39,6 +41,8 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
+      with:
+        node-version: "16.x"
     - run: npm install
     - run: npm install --save-dev eslint@6
     - run: npm test
@@ -48,6 +52,8 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
+      with:
+        node-version: "16.x"
     - run: npm install
     - run: npm install --save-dev eslint@7
     - run: npm test