upgrade node version in build

Author: rommguy

.github/workflows/build.yml

@@ -7,8 +7,8 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
-          node-version: 12
+          node-version: 14
       - run: npm install
       - run: npm test