upgrade to go1.16 (#60)

Author: kjda

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.14
+          go-version: 1.16
       -
         name: Import GPG key
         id: import_gpg