Bump node version

Author: timocov

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
-        node-version: 8
+        node-version: 12
     - run: npm install
     - run: npm run lint
     - run: npm run build