fixed go versions

Author: Code-Hex

.github/workflows/test.yml

@@ -19,5 +19,7 @@ jobs:
       uses: actions/checkout@v2
     - name: setup go
       uses: actions/setup-go@v2
+      with:
+        go-version: '^1.16.2'
     - name: vet
       run: go vet ./...