ci: run lint on node 12

Author: fisker

.github/workflows/continuous-integration.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@master
         with:
-          node-version: 10.x
+          node-version: 12.x
 
       - name: Install Dependencies
         run: yarn