add f.Sync to try and address #9

Author: shayne

.gitignore

@@ -1,5 +1,6 @@
 *.exe
+.vscode/
 vendor/
-example/
+examples/
 foo.go
 foo_test.go

pkg/hostsapi/hostsapi.go

@@ -182,6 +182,10 @@ func (h *HostsAPI) Write() error {
 	defer f.Close()
 
 	f.Write(outbuf.Bytes())
+	err = f.Sync()
+	if err != nil {
+		return err
+	}
 
 	return nil
 }