GitHub Actions の Go のバージョンを指定

Author: kobayashi-m42

.github/workflows/ci.yml

@@ -16,6 +16,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-go@v2
+        with:
+          go-version: '1.16'
       - uses: actions/checkout@v2
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v2