ci: bump nodejs version in actions (#404)

Author: jozefhruska

.github/workflows/node.js.yml

@@ -5,17 +5,17 @@ name: Node.js CI
 
 on:
   push:
-    branches: [master, next]
+    branches: [master]
   pull_request:
-    branches: [master, next]
+    branches: [master]
 
 jobs:
   build:
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v2