node-versionを16系に変更

Author: dc7290

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: '16.x'
           registry-url: 'https://registry.npmjs.org'
       - name: release on npm
         run: |