Fix for node v6

.github/workflows/node-test.yml

@@ -5,14 +5,11 @@ name: Node.js CI
 on: [push, pull_request]
 
 jobs:
-  build:
-
+  test:
     runs-on: ubuntu-latest
-
     strategy:
       matrix:
-        node-version: [6, 8, 10, 12, 14, 16]
-
+        node-version: [8, 10, 12, 14, 16]
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
@@ -21,4 +18,17 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - name: Install dependencies
         run: npm ci
-      - run: npm test
+      - run: npm test
+
+  # It seems that npm for node v6 does not have the ci command.
+  testv6:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js 6
+        uses: actions/setup-node@v2
+        with:
+          node-version: 6
+      - name: Install dependencies
+        run: npm install
+      - run: npm test