Merge pull request #39 from dscho/node-18.x

PR: test with node.js 18.x

Author: dscho

.github/workflows/pr.yml

@@ -6,6 +6,9 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
       - uses: actions/checkout@v3
       - name: npm install
         run: npm install