Update node.js.yml

Author: dhkatz

.github/workflows/node.js.yml

@@ -21,6 +21,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - uses: r-lib/actions/setup-pandoc@v1
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v2
       with: