ci(actions): enable testing on node 14, 16, 18

re #55

Author: george43g

.github/workflows/npm-publish.yml

@@ -18,11 +18,15 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [ 14, 16, 18 ]
+    name: Node ${{ matrix.node }} test
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: ${{ matrix.node }}
           cache: 'npm'
       - run: npm ci
       - run: npm test