add unit test and cleanup (#28)

* remove unnessary import

* use mock for child_process.spawnSync()

* document useful resources

* use v1.1.0 for daily scan

.github/workflows/daily.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v1
       - name: install dependencies
         run: npm ci
-      - uses: oke-py/npm-audit-action@v1.0.0
+      - uses: oke-py/npm-audit-action@v1.1.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           issue_assignees: oke-py