Use node14 in CI

Author: koddsson

.github/workflows/nodejs.yml

@@ -6,10 +6,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js 12.x
+    - name: Use Node.js 14.x
       uses: actions/setup-node@v1
       with:
-        node-version: 12.x
+        node-version: 14.x
     - name: npm install, build, and test
       run: |
         npm install