Add node 14.

Author: MoMannn

.github/workflows/node.js.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [10, 12] # https://nodejs.org/en/about/releases/
+        node-version: [10, 12, 14] # https://nodejs.org/en/about/releases/
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}