Avoid error like:
src/ApiManager.cpp: In member function 'bool sledovanitvcz::ApiManager::pairDevice(Json::Value&)': src/ApiManager.cpp:300:110: error: 'class std::basic_ostream' has no member named 'str'
(std::ostringstream{} << std::chrono::high_resolution_clock::now().time_since_epoch().count()).str();
^~~
Avoid error like: src/ApiManager.cpp: In member function 'bool sledovanitvcz::ApiManager::pairDevice(Json::Value&)': src/ApiManager.cpp:300:110: error: 'class std::basic_ostream' has no member named 'str'
(std::ostringstream{} << std::chrono::high_resolution_clock::now().time_since_epoch().count()).str();
^~~
Fixes #95