include std::array to fix building error

[a-andreyev]

without this I'm not able to build master branch. With this include it's building and working

[SrTobi]

I get the same error. The question is why are we not using std::array (then <array> has to be included). I did a quick compile and it compiles with boost::asio. Tests are passing as well... do we even have tests for the server? 😃

[florianjacob]

@Scheirle as boost::array is only used in http_request.hpp, I'm assigning you. Do you have any objections on it being replaced with an std::array?

@a-andreyev thanks for your contribution & interest. 😄 👍 Do you want to extend it a little and replace boost::array with std::array?

[a-andreyev]

moved from boost to std array, building and running too, thanks for the hint @SrTobi

[Scheirle]

Thanks @a-andreyev. Apologies for the delay!