Add CodeQL workflow

Update README

Update Node.js workflow

Fix tests

.github/workflows/node-workflow.yml

@@ -24,10 +24,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Setup Node.js 15.x
+      - name: Setup Node.js 16.x
         uses: actions/setup-node@v1
         with:
-          node-version: 15.x
+          node-version: 16.x
 
       - name: Install dependencies
         run: npm install
@@ -41,7 +41,14 @@ jobs:
       - name: Run tests
         run: npm test
 
+      - name: Run npm audit
+        run: npm audit
+
       - name: Send Coverage
-        continue-on-error: true
-        timeout-minutes: 1
-        run: curl -s https://codecov.io/bash | bash -s -- -t ${{secrets.CODECOV_TOKEN}} -f coverage/lcov.info -n github-actions-codecov-${{ matrix.operating-system }}
+        uses: codecov/codecov-action@v2
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage/lcov.info
+          name: github-actions-codecov-${{ matrix.operating-system }}
+          fail_ci_if_error: false
+          verbose: true