Use Node 12 in CI

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: 10.x
+          node-version: 12.x
       - uses: actions/cache@v2
         id: cache
         with:
@@ -40,7 +40,7 @@ jobs:
           fetch-depth: 2
       - uses: actions/setup-node@v2
         with:
-          node-version: 10.x
+          node-version: 12.x
       - uses: actions/cache@v2
         id: cache
         with: