ci: use Node.js v12.x

Author: codebytere

.github/workflows/nodejs.yml

@@ -15,10 +15,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@master
-    - name: Use Node.js 10.x
+    - name: Use Node.js 12.x
       uses: actions/setup-node@v1
       with:
-        version: 10.x
+        version: 12.x
     - name: npm install, build, and test
       run: |
         npm install