Boost get_io_service deprecated

[nandlab]

Hello Dimitry,
thanks for sharing this C++ firmata library!
Some boost functions you used deprecated and it did not compile. I forked this repository to https://github.com/NANDLAB/firmata and fixed it. I can create a pull request if you want.

I changed

port_.get_io_service().reset();
port_.get_io_service().run_one();

to

asio::io_context& ioc = static_cast<asio::io_service&>(port_.get_executor().context());
ioc.restart();
ioc.run_one();

[dimitry-ishenko]

Thanks for the heads-up. I will try to get to it to fix things up.