Merge pull request #43 from harakeishi/update/release_action_go_version

Update the version of go used in the release action to 1.16

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15
+          go-version: 1.16
       -
         name: Create tag
         id: create-tag