chore: run unit test with go 1.14 (#1084)

.github/workflows/go.yml

@@ -27,6 +27,8 @@ jobs:
 
     - name: Test
       run: go test -race -coverprofile=coverage.txt -covermode=atomic ./...
+      with:
+        go-version: 1.14
 
     - name: Codecov
       uses: codecov/codecov-action@v2