Add Go 1.17 to GitHub Actions

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       max-parallel: 4
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        go-version: [1.16]
+        go-version: [1.16, 1.17]
     steps:
     - name: Set up Go
       uses: actions/setup-go@v2