Verify lockfileVersion

Author: mroderick

.github/workflows/main.yml

@@ -7,6 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: mansona/npm-lockfile-version@v1
       - uses: actions/setup-node@v2
         with:
           node-version: "16"