feat(build): check node 13 and 14 for github actions

Increases node version up to 14 LTS

Author: lubber-de

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node_version: [8, 10, 11, 12]
+        node_version: [8, 10, 11, 12, 13, 14]
     steps:
     - uses: actions/checkout@v1
     - name: Use Node.js ${{ matrix.node-version }}