text: Title: Can I use the C++ to connect the bert-serving-server?
  Body: **Prerequisites**
  
  * [x] Are you running the latest `bert-as-service`?
  * [x] Did you follow [the installation](https://github.com/hanxiao/bert-as-service#install) and [the usage](https://github.com/hanxiao/bert-as-service#usage) instructions in `README.md`?
  * [x] Did you check the [FAQ list in `README.md`](https://github.com/hanxiao/bert-as-service#speech_balloon-faq)?
  * [x] Did you perform [a cursory search on existing issues](https://github.com/hanxiao/bert-as-service/issues)?
  
  **Question**
  
  I have finished the training of the text classification using Python and export the symbols and parameters of model. 
  
  Then I want to use C++ to predict the classification, and find there is no C++ API to connect the the `bert-serving-server`.  The way I think of is to use `bert-as-service` to serve HTTP requests in Json and then use the C++ to call the sever via HTTP POST request. Is there any better idea?
  